diff --git a/source/module_hamilt_lcao/hamilt_lcaodft/operator_lcao/veff_lcao.cpp b/source/module_hamilt_lcao/hamilt_lcaodft/operator_lcao/veff_lcao.cpp
index a0d159051c6..b2490f18ab0 100644
--- a/source/module_hamilt_lcao/hamilt_lcaodft/operator_lcao/veff_lcao.cpp
+++ b/source/module_hamilt_lcao/hamilt_lcaodft/operator_lcao/veff_lcao.cpp
@@ -6,11 +6,6 @@
 namespace hamilt
 {
 
-template class Veff<OperatorLCAO<double, double>>;
-
-template class Veff<OperatorLCAO<std::complex<double>, double>>;
-
-template class Veff<OperatorLCAO<std::complex<double>, std::complex<double>>>;
 
 // initialize_HR()
 template <typename TK, typename TR>
@@ -159,4 +154,11 @@ void Veff<OperatorLCAO<double, double>>::contributeHR()
     ModuleBase::timer::tick("Veff", "contributeHR");
 }
 
-}
\ No newline at end of file
+// definition of class template should in the end of file to avoid compiling warning 
+template class Veff<OperatorLCAO<double, double>>;
+
+template class Veff<OperatorLCAO<std::complex<double>, double>>;
+
+template class Veff<OperatorLCAO<std::complex<double>, std::complex<double>>>;
+
+}