diff --git a/Fengling.RiskControl.Application/Events/LotteryCompletedEventHandler.cs b/Fengling.RiskControl.Application/Events/LotteryCompletedEventHandler.cs
index 5863ff5..773f5cc 100644
--- a/Fengling.RiskControl.Application/Events/LotteryCompletedEventHandler.cs
+++ b/Fengling.RiskControl.Application/Events/LotteryCompletedEventHandler.cs
@@ -7,6 +7,8 @@ namespace Fengling.RiskControl.Application.Events;
 
 public class LotteryCompletedEventHandler : INotificationHandler<LotteryCompletedEvent>
 {
+    private const int BIG_WIN_MULTIPLIER = 5;
+
     private readonly IRiskScoreRepository _scoreRepository;
 
     public LotteryCompletedEventHandler(IRiskScoreRepository scoreRepository)
@@ -22,7 +24,7 @@ public class LotteryCompletedEventHandler : INotificationHandler<LotteryComplete
             notification.ActivityId.ToString(),
             expiresAt: DateTime.UtcNow.AddDays(1));
 
-        if (notification.IsWin && notification.WinAmount > notification.StakePoints * 5)
+        if (notification.IsWin && notification.WinAmount > notification.StakePoints * BIG_WIN_MULTIPLIER)
         {
             score.AddRiskFactor("big_win", 20, "赢得超过投入5倍");
         }
diff --git a/Fengling.RiskControl.Application/Events/RiskAlertTriggeredEventHandler.cs b/Fengling.RiskControl.Application/Events/RiskAlertTriggeredEventHandler.cs
index 64b0211..0f0c785 100644
--- a/Fengling.RiskControl.Application/Events/RiskAlertTriggeredEventHandler.cs
+++ b/Fengling.RiskControl.Application/Events/RiskAlertTriggeredEventHandler.cs
@@ -7,6 +7,8 @@ namespace Fengling.RiskControl.Application.Events;
 
 public class RiskAlertTriggeredEventHandler : INotificationHandler<RiskAlertTriggeredEvent>
 {
+    private const int ALERT_TRIGGER_THRESHOLD = 30;
+
     private readonly IRiskAlertService _alertService;
 
     public RiskAlertTriggeredEventHandler(IRiskAlertService alertService)
@@ -16,7 +18,7 @@ public class RiskAlertTriggeredEventHandler : INotificationHandler<RiskAlertTrig
 
     public async Task Handle(RiskAlertTriggeredEvent notification, CancellationToken cancellationToken)
     {
-        if (notification.RiskScore < 30)
+        if (notification.RiskScore < ALERT_TRIGGER_THRESHOLD)
             return;
 
         var priority = notification.RiskScore switch
diff --git a/Fengling.RiskControl.Application/Services/LotteryService.cs b/Fengling.RiskControl.Application/Services/LotteryService.cs
index 546a102..f52c6e0 100644
--- a/Fengling.RiskControl.Application/Services/LotteryService.cs
+++ b/Fengling.RiskControl.Application/Services/LotteryService.cs
@@ -7,6 +7,10 @@ namespace Fengling.RiskControl.Application.Services;
 
 public class LotteryService : ILotteryService
 {
+    private const double WIN_PROBABILITY = 0.3;
+    private const int MIN_WIN_MULTIPLIER = 2;
+    private const int MAX_WIN_MULTIPLIER = 10;
+
     private readonly ILotteryActivityRepository _activityRepository;
     private readonly IRiskEvaluationService _riskService;
     private readonly IMediator _mediator;
@@ -75,8 +79,8 @@ public class LotteryService : ILotteryService
     private (int winAmount, bool isWin) SimulateLotteryOutcome(int stakePoints)
     {
         var random = new Random();
-        var isWin = random.NextDouble() < 0.3;
-        var winAmount = isWin ? stakePoints * random.Next(2, 10) : 0;
+        var isWin = random.NextDouble() < WIN_PROBABILITY;
+        var winAmount = isWin ? stakePoints * random.Next(MIN_WIN_MULTIPLIER, MAX_WIN_MULTIPLIER + 1) : 0;
         return (winAmount, isWin);
     }
 
diff --git a/Fengling.RiskControl.Application/Services/RiskAlertService.cs b/Fengling.RiskControl.Application/Services/RiskAlertService.cs
index 8f07247..fc3031a 100644
--- a/Fengling.RiskControl.Application/Services/RiskAlertService.cs
+++ b/Fengling.RiskControl.Application/Services/RiskAlertService.cs
@@ -22,9 +22,6 @@ public class RiskAlertService : IRiskAlertService
         var alert = RiskAlert.Create(memberId, alertType, description, priority);
         await _alertRepository.AddAsync(alert);
 
-        await _mediator.Publish(new RiskAlertTriggeredEvent(
-            alert.Id, memberId, alertType, 0, description));
-
         return alert;
     }
 
diff --git a/Fengling.RiskControl.Application/Services/RiskEvaluationService.cs b/Fengling.RiskControl.Application/Services/RiskEvaluationService.cs
index 3974510..8457aa4 100644
--- a/Fengling.RiskControl.Application/Services/RiskEvaluationService.cs
+++ b/Fengling.RiskControl.Application/Services/RiskEvaluationService.cs
@@ -7,6 +7,10 @@ namespace Fengling.RiskControl.Application.Services;
 
 public class RiskEvaluationService : IRiskEvaluationService
 {
+    private const int HIGH_THRESHOLD = 70;
+    private const int MEDIUM_THRESHOLD = 30;
+    private const int BLACKLIST_POINTS = 100;
+
     private readonly IRiskRuleRepository _ruleRepository;
     private readonly IRiskScoreRepository _scoreRepository;
     private readonly IMediator _mediator;
@@ -71,18 +75,8 @@ public class RiskEvaluationService : IRiskEvaluationService
 
     private async Task<RiskFactorResult?> EvaluateFrequencyLimitAsync(RiskRule rule, RiskEvaluationRequest request)
     {
-        var config = rule.GetConfig<FrequencyLimitConfig>();
-        var recentCount = 0;
-        if (recentCount >= config.MaxCount)
-        {
-            return new RiskFactorResult
-            {
-                FactorType = "frequency_limit",
-                Points = config.Points,
-                Description = $"超过频率限制: {recentCount}/{config.MaxCount}",
-                RuleName = rule.Name
-            };
-        }
+        // Frequency limit checking requires additional repository method
+        // Implement when ILotteryActivityRepository.GetLotteryCountByMemberAndTypeAsync is available
         return null;
     }
 
@@ -113,7 +107,7 @@ public class RiskEvaluationService : IRiskEvaluationService
             return new RiskFactorResult
             {
                 FactorType = "blacklist",
-                Points = 100,
+                Points = BLACKLIST_POINTS,
                 Description = "用户在黑名单中",
                 RuleName = rule.Name
             };
@@ -123,8 +117,8 @@ public class RiskEvaluationService : IRiskEvaluationService
 
     private RiskLevel DetermineRiskLevel(int score)
     {
-        return score >= 70 ? RiskLevel.High :
-               score >= 30 ? RiskLevel.Medium :
+        return score >= HIGH_THRESHOLD ? RiskLevel.High :
+               score >= MEDIUM_THRESHOLD ? RiskLevel.Medium :
                RiskLevel.Low;
     }