diff --git a/Fengling.RiskControl.Domain/Aggregates/LotteryActivities/LotteryActivity.cs b/Fengling.RiskControl.Domain/Aggregates/LotteryActivities/LotteryActivity.cs
new file mode 100644
index 0000000..deef236
--- /dev/null
+++ b/Fengling.RiskControl.Domain/Aggregates/LotteryActivities/LotteryActivity.cs
@@ -0,0 +1,50 @@
+using NetCorePal.Extensions.Domain;
+
+namespace Fengling.RiskControl.Domain.Aggregates.LotteryActivities;
+
+public class LotteryActivity : Entity<long>, IAggregateRoot
+{
+    public long MemberId { get; private set; }
+    public string ActivityType { get; private set; } = string.Empty;
+    public int StakePoints { get; private set; }
+    public int? WinAmount { get; private set; }
+    public LotteryStatus Status { get; private set; } = LotteryStatus.Pending;
+    public string? IpAddress { get; private set; }
+    public string? DeviceId { get; private set; }
+    public DateTime CreatedAt { get; private set; } = DateTime.UtcNow;
+    public DateTime? CompletedAt { get; private set; }
+
+    private LotteryActivity() { }
+
+    public static LotteryActivity Create(long memberId, string activityType, int stakePoints,
+        string? ipAddress = null, string? deviceId = null)
+    {
+        return new LotteryActivity
+        {
+            MemberId = memberId,
+            ActivityType = activityType,
+            StakePoints = stakePoints,
+            Status = LotteryStatus.Pending,
+            IpAddress = ipAddress,
+            DeviceId = deviceId
+        };
+    }
+
+    public void MarkProcessing()
+    {
+        Status = LotteryStatus.Processing;
+    }
+
+    public void Complete(int winAmount, bool isWin)
+    {
+        Status = isWin ? LotteryStatus.Won : LotteryStatus.Lost;
+        WinAmount = isWin ? winAmount : null;
+        CompletedAt = DateTime.UtcNow;
+    }
+
+    public void Fail(string reason)
+    {
+        Status = LotteryStatus.Failed;
+        CompletedAt = DateTime.UtcNow;
+    }
+}
diff --git a/Fengling.RiskControl.Domain/Aggregates/LotteryActivities/LotteryStatus.cs b/Fengling.RiskControl.Domain/Aggregates/LotteryActivities/LotteryStatus.cs
new file mode 100644
index 0000000..6444f56
--- /dev/null
+++ b/Fengling.RiskControl.Domain/Aggregates/LotteryActivities/LotteryStatus.cs
@@ -0,0 +1,11 @@
+namespace Fengling.RiskControl.Domain.Aggregates.LotteryActivities;
+
+public enum LotteryStatus
+{
+    Pending = 0,
+    Processing = 1,
+    Won = 2,
+    Lost = 3,
+    Cancelled = 4,
+    Failed = 5
+}
diff --git a/Fengling.RiskControl.Domain/Aggregates/RiskAlerts/RiskAlert.cs b/Fengling.RiskControl.Domain/Aggregates/RiskAlerts/RiskAlert.cs
new file mode 100644
index 0000000..f72ecea
--- /dev/null
+++ b/Fengling.RiskControl.Domain/Aggregates/RiskAlerts/RiskAlert.cs
@@ -0,0 +1,59 @@
+using NetCorePal.Extensions.Domain;
+
+namespace Fengling.RiskControl.Domain.Aggregates.RiskAlerts;
+
+public class RiskAlert : Entity<long>, IAggregateRoot
+{
+    public long MemberId { get; private set; }
+    public string AlertType { get; private set; } = string.Empty;
+    public string Description { get; private set; } = string.Empty;
+    public RiskAlertPriority Priority { get; private set; }
+    public RiskAlertStatus Status { get; private set; } = RiskAlertStatus.Pending;
+    public string? ResolutionNotes { get; private set; }
+    public long? AssignedTo { get; private set; }
+    public DateTime CreatedAt { get; private set; } = DateTime.UtcNow;
+    public DateTime? ResolvedAt { get; private set; }
+
+    private RiskAlert() { }
+
+    public static RiskAlert Create(long memberId, string alertType, string description,
+        RiskAlertPriority priority = RiskAlertPriority.Medium)
+    {
+        return new RiskAlert
+        {
+            MemberId = memberId,
+            AlertType = alertType,
+            Description = description,
+            Priority = priority,
+            Status = RiskAlertStatus.Pending
+        };
+    }
+
+    public void Resolve(string notes)
+    {
+        Status = RiskAlertStatus.Resolved;
+        ResolutionNotes = notes;
+        ResolvedAt = DateTime.UtcNow;
+    }
+
+    public void Dismiss(string notes)
+    {
+        Status = RiskAlertStatus.Dismissed;
+        ResolutionNotes = notes;
+        ResolvedAt = DateTime.UtcNow;
+    }
+
+    public void Escalate()
+    {
+        Priority = Priority == RiskAlertPriority.Critical 
+            ? RiskAlertPriority.Critical 
+            : Priority + 1;
+        Status = RiskAlertStatus.Investigating;
+    }
+
+    public void AssignTo(long adminId)
+    {
+        AssignedTo = adminId;
+        Status = RiskAlertStatus.Investigating;
+    }
+}
diff --git a/Fengling.RiskControl.Domain/Aggregates/RiskAlerts/RiskAlertPriority.cs b/Fengling.RiskControl.Domain/Aggregates/RiskAlerts/RiskAlertPriority.cs
new file mode 100644
index 0000000..cde238f
--- /dev/null
+++ b/Fengling.RiskControl.Domain/Aggregates/RiskAlerts/RiskAlertPriority.cs
@@ -0,0 +1,9 @@
+namespace Fengling.RiskControl.Domain.Aggregates.RiskAlerts;
+
+public enum RiskAlertPriority
+{
+    Low = 0,
+    Medium = 1,
+    High = 2,
+    Critical = 3
+}
diff --git a/Fengling.RiskControl.Domain/Aggregates/RiskAlerts/RiskAlertStatus.cs b/Fengling.RiskControl.Domain/Aggregates/RiskAlerts/RiskAlertStatus.cs
new file mode 100644
index 0000000..7933c51
--- /dev/null
+++ b/Fengling.RiskControl.Domain/Aggregates/RiskAlerts/RiskAlertStatus.cs
@@ -0,0 +1,9 @@
+namespace Fengling.RiskControl.Domain.Aggregates.RiskAlerts;
+
+public enum RiskAlertStatus
+{
+    Pending = 0,
+    Investigating = 1,
+    Resolved = 2,
+    Dismissed = 3
+}
diff --git a/Fengling.RiskControl.Domain/Aggregates/RiskRules/RiskRule.cs b/Fengling.RiskControl.Domain/Aggregates/RiskRules/RiskRule.cs
new file mode 100644
index 0000000..7394e7f
--- /dev/null
+++ b/Fengling.RiskControl.Domain/Aggregates/RiskRules/RiskRule.cs
@@ -0,0 +1,60 @@
+using NetCorePal.Extensions.Domain;
+
+namespace Fengling.RiskControl.Domain.Aggregates.RiskRules;
+
+public class RiskRule : Entity<long>, IAggregateRoot
+{
+    public string Name { get; private set; } = string.Empty;
+    public string Description { get; private set; } = string.Empty;
+    public RiskRuleType RuleType { get; private set; }
+    public RiskRuleAction Action { get; private set; }
+    public string ConfigJson { get; private set; } = string.Empty;
+    public int Priority { get; private set; }
+    public bool IsActive { get; private set; } = true;
+    public DateTime CreatedAt { get; private set; } = DateTime.UtcNow;
+    public DateTime? UpdatedAt { get; private set; }
+
+    private RiskRule() { }
+
+    public static RiskRule Create(string name, string description, RiskRuleType type, 
+        RiskRuleAction action, string configJson, int priority = 0)
+    {
+        if (string.IsNullOrWhiteSpace(name))
+            throw new ArgumentException("规则名称不能为空", nameof(name));
+
+        if (string.IsNullOrWhiteSpace(configJson))
+            throw new ArgumentException("配置不能为空", nameof(configJson));
+
+        System.Text.Json.JsonDocument.Parse(configJson);
+
+        return new RiskRule
+        {
+            Name = name,
+            Description = description,
+            RuleType = type,
+            Action = action,
+            ConfigJson = configJson,
+            Priority = priority,
+            IsActive = true,
+            CreatedAt = DateTime.UtcNow
+        };
+    }
+
+    public void Deactivate()
+    {
+        IsActive = false;
+        UpdatedAt = DateTime.UtcNow;
+    }
+
+    public void UpdateConfig(string newConfigJson)
+    {
+        System.Text.Json.JsonDocument.Parse(newConfigJson);
+        ConfigJson = newConfigJson;
+        UpdatedAt = DateTime.UtcNow;
+    }
+
+    public T GetConfig<T>() where T : class
+    {
+        return System.Text.Json.JsonSerializer.Deserialize<T>(ConfigJson)!;
+    }
+}
diff --git a/Fengling.RiskControl.Domain/Aggregates/RiskRules/RiskRuleAction.cs b/Fengling.RiskControl.Domain/Aggregates/RiskRules/RiskRuleAction.cs
new file mode 100644
index 0000000..d306296
--- /dev/null
+++ b/Fengling.RiskControl.Domain/Aggregates/RiskRules/RiskRuleAction.cs
@@ -0,0 +1,11 @@
+namespace Fengling.RiskControl.Domain.Aggregates.RiskRules;
+
+public enum RiskRuleAction
+{
+    Allow = 0,
+    Block = 1,
+    RequireVerification = 2,
+    FlagForReview = 3,
+    RateLimit = 4,
+    LogOnly = 5
+}
diff --git a/Fengling.RiskControl.Domain/Aggregates/RiskRules/RiskRuleType.cs b/Fengling.RiskControl.Domain/Aggregates/RiskRules/RiskRuleType.cs
new file mode 100644
index 0000000..4d7c598
--- /dev/null
+++ b/Fengling.RiskControl.Domain/Aggregates/RiskRules/RiskRuleType.cs
@@ -0,0 +1,15 @@
+namespace Fengling.RiskControl.Domain.Aggregates.RiskRules;
+
+public enum RiskRuleType
+{
+    FrequencyLimit = 1,      // 频率限制
+    AmountLimit = 2,          // 金额限制
+    TimeWindowLimit = 3,      // 时间窗口限制
+    GeoRestriction = 4,       // 地域限制
+    DeviceFingerprint = 5,    // 设备指纹
+    BehaviorPattern = 6,      // 行为模式
+    Blacklist = 7,            // 黑名单
+    Whitelist = 8,            // 白名单
+    VelocityCheck = 9,        // 速度检测
+    AnomalyDetection = 10     // 异常检测
+}
diff --git a/Fengling.RiskControl.Domain/Aggregates/RiskScores/RiskFactor.cs b/Fengling.RiskControl.Domain/Aggregates/RiskScores/RiskFactor.cs
new file mode 100644
index 0000000..aa24af9
--- /dev/null
+++ b/Fengling.RiskControl.Domain/Aggregates/RiskScores/RiskFactor.cs
@@ -0,0 +1,21 @@
+namespace Fengling.RiskControl.Domain.Aggregates.RiskScores;
+
+public class RiskFactor
+{
+    public string FactorType { get; private set; } = string.Empty;
+    public int Points { get; private set; }
+    public string Description { get; private set; } = string.Empty;
+    public DateTime CreatedAt { get; private set; } = DateTime.UtcNow;
+
+    private RiskFactor() { }
+
+    public static RiskFactor Create(string factorType, int points, string description)
+    {
+        return new RiskFactor
+        {
+            FactorType = factorType,
+            Points = points,
+            Description = description
+        };
+    }
+}
diff --git a/Fengling.RiskControl.Domain/Aggregates/RiskScores/RiskLevel.cs b/Fengling.RiskControl.Domain/Aggregates/RiskScores/RiskLevel.cs
new file mode 100644
index 0000000..8fc0959
--- /dev/null
+++ b/Fengling.RiskControl.Domain/Aggregates/RiskScores/RiskLevel.cs
@@ -0,0 +1,9 @@
+namespace Fengling.RiskControl.Domain.Aggregates.RiskScores;
+
+public enum RiskLevel
+{
+    Low = 0,
+    Medium = 1,
+    High = 2,
+    Critical = 3
+}
diff --git a/Fengling.RiskControl.Domain/Aggregates/RiskScores/RiskScore.cs b/Fengling.RiskControl.Domain/Aggregates/RiskScores/RiskScore.cs
new file mode 100644
index 0000000..2fcba61
--- /dev/null
+++ b/Fengling.RiskControl.Domain/Aggregates/RiskScores/RiskScore.cs
@@ -0,0 +1,58 @@
+using NetCorePal.Extensions.Domain;
+
+namespace Fengling.RiskControl.Domain.Aggregates.RiskScores;
+
+public class RiskScore : Entity<long>, IAggregateRoot
+{
+    public long MemberId { get; private set; }
+    public string EntityType { get; private set; } = string.Empty;
+    public string EntityId { get; private set; } = string.Empty;
+    public int TotalScore { get; private set; }
+    public RiskLevel RiskLevel { get; private set; }
+    private readonly List<RiskFactor> _factors = new();
+    public IReadOnlyCollection<RiskFactor> Factors => _factors.AsReadOnly();
+    public DateTime CreatedAt { get; private set; } = DateTime.UtcNow;
+    public DateTime? ExpiresAt { get; private set; }
+
+    private RiskScore() { }
+
+    public static RiskScore Create(long memberId, string entityType, string entityId, 
+        DateTime? expiresAt = null)
+    {
+        return new RiskScore
+        {
+            MemberId = memberId,
+            EntityType = entityType,
+            EntityId = entityId,
+            TotalScore = 0,
+            RiskLevel = RiskLevel.Low,
+            ExpiresAt = expiresAt
+        };
+    }
+
+    public void AddRiskFactor(string factorType, int points, string description)
+    {
+        _factors.Add(RiskFactor.Create(factorType, points, description));
+        RecalculateScore();
+    }
+
+    public void Reset()
+    {
+        _factors.Clear();
+        TotalScore = 0;
+        RiskLevel = RiskLevel.Low;
+    }
+
+    private void RecalculateScore()
+    {
+        TotalScore = _factors.Sum(f => f.Points);
+        RiskLevel = TotalScore >= 70 ? RiskLevel.High :
+                   TotalScore >= 30 ? RiskLevel.Medium :
+                   RiskLevel.Low;
+    }
+
+    public bool IsExpired()
+    {
+        return ExpiresAt.HasValue && DateTime.UtcNow > ExpiresAt.Value;
+    }
+}
diff --git a/Fengling.RiskControl.Domain/Events/LotteryCompletedEvent.cs b/Fengling.RiskControl.Domain/Events/LotteryCompletedEvent.cs
new file mode 100644
index 0000000..83cba8e
--- /dev/null
+++ b/Fengling.RiskControl.Domain/Events/LotteryCompletedEvent.cs
@@ -0,0 +1,24 @@
+using MediatR;
+
+namespace Fengling.RiskControl.Domain.Events;
+
+public class LotteryCompletedEvent : INotification
+{
+    public long ActivityId { get; }
+    public long MemberId { get; }
+    public int StakePoints { get; }
+    public int? WinAmount { get; }
+    public bool IsWin { get; }
+    public int RiskScore { get; }
+
+    public LotteryCompletedEvent(long activityId, long memberId, int stakePoints,
+        int? winAmount, bool isWin, int riskScore)
+    {
+        ActivityId = activityId;
+        MemberId = memberId;
+        StakePoints = stakePoints;
+        WinAmount = winAmount;
+        IsWin = isWin;
+        RiskScore = riskScore;
+    }
+}
diff --git a/Fengling.RiskControl.Domain/Events/RiskAlertTriggeredEvent.cs b/Fengling.RiskControl.Domain/Events/RiskAlertTriggeredEvent.cs
new file mode 100644
index 0000000..8eef9ad
--- /dev/null
+++ b/Fengling.RiskControl.Domain/Events/RiskAlertTriggeredEvent.cs
@@ -0,0 +1,22 @@
+using MediatR;
+
+namespace Fengling.RiskControl.Domain.Events;
+
+public class RiskAlertTriggeredEvent : INotification
+{
+    public long AlertId { get; }
+    public long MemberId { get; }
+    public string AlertType { get; }
+    public int RiskScore { get; }
+    public string Reason { get; }
+
+    public RiskAlertTriggeredEvent(long alertId, long memberId, string alertType, 
+        int riskScore, string reason)
+    {
+        AlertId = alertId;
+        MemberId = memberId;
+        AlertType = alertType;
+        RiskScore = riskScore;
+        Reason = reason;
+    }
+}
diff --git a/Fengling.RiskControl.Domain/Events/RiskAssessmentRequestedEvent.cs b/Fengling.RiskControl.Domain/Events/RiskAssessmentRequestedEvent.cs
new file mode 100644
index 0000000..0b54c29
--- /dev/null
+++ b/Fengling.RiskControl.Domain/Events/RiskAssessmentRequestedEvent.cs
@@ -0,0 +1,24 @@
+using MediatR;
+
+namespace Fengling.RiskControl.Domain.Events;
+
+public class RiskAssessmentRequestedEvent : INotification
+{
+    public long MemberId { get; }
+    public string EntityType { get; }
+    public string EntityId { get; }
+    public string ActionType { get; }
+    public Dictionary<string, object> Context { get; }
+    public DateTime RequestedAt { get; }
+
+    public RiskAssessmentRequestedEvent(long memberId, string entityType, string entityId,
+        string actionType, Dictionary<string, object>? context = null)
+    {
+        MemberId = memberId;
+        EntityType = entityType;
+        EntityId = entityId;
+        ActionType = actionType;
+        Context = context ?? new Dictionary<string, object>();
+        RequestedAt = DateTime.UtcNow;
+    }
+}