diff --git a/src/CounterDrone.Core/Simulation/SimulationEngine.cs b/src/CounterDrone.Core/Simulation/SimulationEngine.cs
index 8332aa1..a4c3c4c 100644
--- a/src/CounterDrone.Core/Simulation/SimulationEngine.cs
+++ b/src/CounterDrone.Core/Simulation/SimulationEngine.cs
@@ -275,22 +275,28 @@ namespace CounterDrone.Core.Simulation
                 }
             }
 
-            // 6. 毁伤判定：积分路径段在云内的时间
+            // 6. 毁伤判定：积分路径段在云内的时间（快速排斥：先检查包围盒）
             var (wvx, wvy, wvz) = Kinematics.WindToVector((WindDirection)_scene.WindDirection, (float)_scene.WindSpeed);
             float cloudDx = wvx * scaledDt, cloudDy = wvy * scaledDt, cloudDz = wvz * scaledDt;
+            float effectiveConcentration = (float)_ammoSpec.EffectiveConcentration;
             for (int di = 0; di < _flyingDrones.Count; di++)
             {
                 var drone = _flyingDrones[di];
                 for (int ci = 0; ci < _clouds.Count; ci++)
                 {
                     var cloud = _clouds[ci];
+                    if (cloud.Dispersion.CoreDensity < effectiveConcentration) continue;
+                    // 快速排斥：检查无人机与云团中心的距离是否在 2×有效半径内
+                    float effR = cloud.Dispersion.EffectiveRadius;
                     float ccx = cloud.Dispersion.Center.X, ccy = cloud.Dispersion.Center.Y, ccz = cloud.Dispersion.Center.Z;
+                    float dx = drone.PosX - ccx, dy = drone.PosY - ccy, dz = drone.PosZ - ccz;
+                    float distSq = dx * dx + dy * dy + dz * dz;
+                    if (distSq > effR * effR * 4) continue; // 距离 > 2R，不可能穿云
                     float inCloudDistance = DamageAssessment.PathInSphere(
                         drone.PrevX - (ccx - cloudDx), drone.PrevY - (ccy - cloudDy), drone.PrevZ - (ccz - cloudDz),
                         drone.PosX - ccx, drone.PosY - ccy, drone.PosZ - ccz,
-                        0f, 0f, 0f,
-                        cloud.Dispersion.EffectiveRadius);
-                    if (inCloudDistance > 0 && cloud.Dispersion.CoreDensity >= (float)_ammoSpec.EffectiveConcentration)
+                        0f, 0f, 0f, effR);
+                    if (inCloudDistance > 0)
                     {
                         float exposureIncrement = inCloudDistance / (drone.TypicalSpeed / 3.6f);
                         drone.ExposureTime += exposureIncrement;
diff --git a/src/Unity/Assets/Plugins/CounterDrone.Core/CounterDrone.Core.dll b/src/Unity/Assets/Plugins/CounterDrone.Core/CounterDrone.Core.dll
index f183442..e63c440 100644
Binary files a/src/Unity/Assets/Plugins/CounterDrone.Core/CounterDrone.Core.dll and b/src/Unity/Assets/Plugins/CounterDrone.Core/CounterDrone.Core.dll differ
diff --git a/src/Unity/Assets/Plugins/CounterDrone.Core/CounterDrone.Core.pdb b/src/Unity/Assets/Plugins/CounterDrone.Core/CounterDrone.Core.pdb
index 77b957c..b9d8a70 100644
Binary files a/src/Unity/Assets/Plugins/CounterDrone.Core/CounterDrone.Core.pdb and b/src/Unity/Assets/Plugins/CounterDrone.Core/CounterDrone.Core.pdb differ