diff --git a/cocos/2d/CCParticleSystemQuad.cpp b/cocos/2d/CCParticleSystemQuad.cpp
index fca8bf59e9..ab14d1e8e4 100644
--- a/cocos/2d/CCParticleSystemQuad.cpp
+++ b/cocos/2d/CCParticleSystemQuad.cpp
@@ -527,6 +527,7 @@ void ParticleSystemQuad::setTotalParticles(int tp)
         _totalParticles = tp;
     }
     
+    _emissionRate = _totalParticles / _life;
     resetSystem();
 }
 
diff --git a/tests/test-cpp/Classes/ParticleTest/ParticleTest.cpp b/tests/test-cpp/Classes/ParticleTest/ParticleTest.cpp
index 35b64fa0e1..bf1480b1a9 100644
--- a/tests/test-cpp/Classes/ParticleTest/ParticleTest.cpp
+++ b/tests/test-cpp/Classes/ParticleTest/ParticleTest.cpp
@@ -1905,7 +1905,6 @@ void Issue3990::onEnter()
     
     _emitter->setPositionType(ParticleSystem::PositionType::GROUPED);
     _emitter->setTotalParticles(1000);
-    _emitter->setLife(20);
     
     _emitter->setPosition(VisibleRect::center());