diff --git a/source/src_io/write_rho_cube.cpp b/source/src_io/write_rho_cube.cpp
index 9604289fc6..eac8cec179 100644
--- a/source/src_io/write_rho_cube.cpp
+++ b/source/src_io/write_rho_cube.cpp
@@ -9,7 +9,10 @@ void Charge::write_rho_cube(
 	const int &precision) 
 {
     ModuleBase::TITLE("Charge","write_rho_cube");
-
+	if (out_chg==0) 
+	{
+		return;
+	}
 	time_t start, end;
 	std::ofstream ofs;