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diff --git a/Assets/Picture/火球.png b/Assets/Picture/火球.png
index e272f7c..47ad60c 100644
Binary files a/Assets/Picture/火球.png and b/Assets/Picture/火球.png differ
diff --git a/Assets/Picture/火球.png.meta b/Assets/Picture/火球.png.meta
index b6c163f..f4fb9b6 100644
--- a/Assets/Picture/火球.png.meta
+++ b/Assets/Picture/火球.png.meta
@@ -6,7 +6,7 @@ TextureImporter:
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   mipmaps:
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-    enableMipMap: 0
+    enableMipMap: 1
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     fadeOut: 0
@@ -40,8 +40,8 @@ TextureImporter:
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@@ -55,9 +55,9 @@ TextureImporter:
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+  textureType: 0
   textureShape: 1
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diff --git a/Assets/Prefabs/武器飞行物/火球.prefab b/Assets/Prefabs/武器飞行物/火球.prefab
index 60dbb5d..0c08d26 100644
--- a/Assets/Prefabs/武器飞行物/火球.prefab
+++ b/Assets/Prefabs/武器飞行物/火球.prefab
@@ -1,83 +1,141 @@
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diff --git a/Assets/Scenes/Chapter1/CoreBattleTest.scene b/Assets/Scenes/Chapter1/CoreBattleTest.scene
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diff --git a/Assets/Script/Billboard.cs b/Assets/Script/Billboard.cs
new file mode 100644
index 0000000..a62dbd5
--- /dev/null
+++ b/Assets/Script/Billboard.cs
@@ -0,0 +1,24 @@
+using UnityEngine;
+
+public class Billboard : MonoBehaviour
+{
+    private Camera _cam;
+
+    private void Awake()
+    {
+        _cam = Camera.main;
+        if (_cam == null)
+        {
+            Debug.LogWarning("[Billboard] No main camera found.");
+        }
+    }
+
+    private void Update()
+    {
+        if (_cam != null)
+        {
+            transform.LookAt(transform.position + _cam.transform.rotation * Vector3.forward,
+                             _cam.transform.rotation * Vector3.up);
+        }
+    }
+}
\ No newline at end of file
diff --git a/Assets/Script/Billboard.cs.meta b/Assets/Script/Billboard.cs.meta
new file mode 100644
index 0000000..e72efcb
--- /dev/null
+++ b/Assets/Script/Billboard.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Assets/Script/Projectile.cs b/Assets/Script/Projectile.cs
index 5410ff7..cd95596 100644
--- a/Assets/Script/Projectile.cs
+++ b/Assets/Script/Projectile.cs
@@ -80,7 +80,8 @@ public class Projectile : MonoBehaviour
             }
         }
 
-        transform.forward = direction;
+        // 火球保持 Prefab 固定角度，不随飞行方向旋转
+        // transform.forward = direction;
         transform.position += direction * distance;
     }