diff --git a/source/Behavior/ContactAttacking.ts b/source/Behavior/ContactAttacking.ts
index 93e9e32..b5f898f 100644
--- a/source/Behavior/ContactAttacking.ts
+++ b/source/Behavior/ContactAttacking.ts
@@ -6,7 +6,8 @@ import { Model } from "@Model/Model";
 type IContactAttackingBehaviorParameter = {
     target: "CLG",
 	success: "number",
-    range: "number"
+    range: "number",
+    assimilate: "CG",
 }
 
 type IContactAttackingBehaviorEvent = {}
@@ -26,7 +27,8 @@ class ContactAttacking extends Behavior<IContactAttackingBehaviorParameter, ICon
 	public override parameterOption = {
 		target: { type: "CLG", name: "$Target" },
         range: { type: "number", name: "$Range", defaultValue: .05, numberMin: 0, numberStep: .01 },
-        success: { type: "number", name: "$Success", defaultValue: 90, numberMin: 0, numberMax: 100, numberStep: 5 }
+        success: { type: "number", name: "$Success", defaultValue: 90, numberMin: 0, numberMax: 100, numberStep: 5 },
+        assimilate: { type: "CG", name: "$Assimilate"}
 	};
 
     public effect = (individual: Individual, group: Group, model: Model, t: number): void => {
@@ -46,6 +48,10 @@ class ContactAttacking extends Behavior<IContactAttackingBehaviorParameter, ICon
                     // 成功判定
                     if (Math.random() * 100 < this.parameter.success) {
                         targetIndividual.die();
+
+                        if (this.parameter.assimilate?.objects) {
+                            individual.transfer(this.parameter.assimilate.objects);
+                        }
                     }
 				}
 			});
@@ -72,6 +78,10 @@ class ContactAttacking extends Behavior<IContactAttackingBehaviorParameter, ICon
         "$Intro": {
             "ZH_CN": "攻击进入共进范围的目标群个体",
             "EN_US": "Attack the target group and individual entering the range"
+        },
+        "$Assimilate": {
+            "ZH_CN": "同化",
+            "EN_US": "Assimilate"
         }
     };
 }
diff --git a/source/Behavior/Tracking.ts b/source/Behavior/Tracking.ts
index 3ea2ed8..01d8cf1 100644
--- a/source/Behavior/Tracking.ts
+++ b/source/Behavior/Tracking.ts
@@ -7,6 +7,7 @@ type ITrackingBehaviorParameter = {
     target: "CLG",
 	strength: "number",
     range: "number",
+    angle: "number",
     lock: "boolean"
 }
 
@@ -28,12 +29,23 @@ class Tracking extends Behavior<ITrackingBehaviorParameter, ITrackingBehaviorEve
 		target: { type: "CLG", name: "$Target" },
         lock: { type: "boolean", name: "$Lock", defaultValue: false },
         range: { type: "number", name: "$Range", defaultValue: 4, numberMin: 0, numberStep: .1 },
+        angle: { type: "number", name: "$Angle", defaultValue: 180, numberMin: 0, numberMax: 360, numberStep: 5 },
 		strength: { type: "number", name: "$Strength", defaultValue: 1, numberMin: 0, numberStep: .1 }
 	};
 
     private target: Individual | undefined = undefined;
     private currentDistant: number = Infinity;
 
+    private angle2Vector(v1: number[], v2: number[]): number {
+		return Math.acos(
+			(v1[0] * v2[0] + v1[1] * v2[1] + v1[2] * v2[2]) /
+			(
+				(v1[0] ** 2 + v1[1] ** 2 + v1[2] ** 2) ** 0.5 *
+				(v2[0] ** 2 + v2[1] ** 2 + v2[2] ** 2) ** 0.5
+			)
+		) * 180 / Math.PI;
+	}
+
     private searchTarget(individual: Individual) {
 
 		for (let i = 0; i < this.parameter.target.objects.length; i++) {
@@ -46,8 +58,21 @@ class Tracking extends Behavior<ITrackingBehaviorParameter, ITrackingBehaviorEve
 				let dis = targetIndividual.distanceTo(individual);
 
 				if (dis < this.currentDistant && dis <= this.parameter.range) {
-					this.target = targetIndividual;
-					this.currentDistant = dis;
+
+                    // 计算目标方位
+                    const targetDir = [
+                        targetIndividual.position[0] - individual.position[0],
+                        targetIndividual.position[1] - individual.position[1],
+                        targetIndividual.position[2] - individual.position[2]
+                    ];
+
+                    // 计算角度
+                    const angle = this.angle2Vector(individual.velocity, targetDir);
+
+                    if (angle < (this.parameter.angle ?? 360) / 2) {
+                        this.target = targetIndividual;
+					    this.currentDistant = dis;
+                    }
 				}
 
 			});
@@ -150,7 +175,11 @@ class Tracking extends Behavior<ITrackingBehaviorParameter, ITrackingBehaviorEve
 		"$Interactive": {
 			"ZH_CN": "交互",
             "EN_US": "Interactive"
-		}
+		},
+        "$Angle": {
+            "ZH_CN": "可视角度",
+            "EN_US": "Viewing angle"
+        }
     };
 }