diff --git a/cocos/particle/models/line-model.ts b/cocos/particle/models/line-model.ts
index 25757b452c7..ddfe51ec500 100644
--- a/cocos/particle/models/line-model.ts
+++ b/cocos/particle/models/line-model.ts
@@ -212,8 +212,8 @@ export class LineModel extends Model {
     public updateIA (count: number) {
         const ia = this._subModels[0].inputAssembler;
         ia.vertexBuffers[0].update(this._vdataF32!);
-        ia.indexCount = this._indexCount * count;
-        this._iaInfo.drawInfos[0] = ia;
+        this._iaInfo.drawInfos[0].firstIndex = 0;
+        this._iaInfo.drawInfos[0].indexCount = this._indexCount * count;
         this._iaInfoBuffer.update(this._iaInfo);
     }
 
diff --git a/cocos/particle/models/particle-batch-model.ts b/cocos/particle/models/particle-batch-model.ts
index cc1d6a864b4..dfc7825c410 100644
--- a/cocos/particle/models/particle-batch-model.ts
+++ b/cocos/particle/models/particle-batch-model.ts
@@ -326,8 +326,8 @@ export default class ParticleBatchModel extends Model {
     public updateIA (count: number) {
         const ia = this._subModels[0].inputAssembler;
         ia.vertexBuffers[0].update(this._vdataF32!);
-        ia.indexCount = this._indexCount * count;
-        this._iaInfo.drawInfos[0] = ia;
+        this._iaInfo.drawInfos[0].firstIndex = 0;
+        this._iaInfo.drawInfos[0].indexCount = this._indexCount * count;
         this._iaInfoBuffer.update(this._iaInfo);
     }
 
diff --git a/cocos/particle/renderer/trail.ts b/cocos/particle/renderer/trail.ts
index 8a858405ca6..cdad7c27213 100644
--- a/cocos/particle/renderer/trail.ts
+++ b/cocos/particle/renderer/trail.ts
@@ -557,8 +557,8 @@ export default class TrailModule {
             const subModel = subModels[0];
             subModel.inputAssembler!.vertexBuffers[0].update(this._vbF32!);
             subModel.inputAssembler!.indexBuffer!.update(this._iBuffer!);
-            subModel.inputAssembler!.indexCount = count;
-            this._iaInfo.drawInfos[0] = subModel.inputAssembler!;
+            this._iaInfo.drawInfos[0].firstIndex = 0;
+            this._iaInfo.drawInfos[0].indexCount = count;
             this._iaInfoBuffer!.update(this._iaInfo);
         }
     }