diff --git a/source/module_esolver/esolver_gets.cpp b/source/module_esolver/esolver_gets.cpp
index cf51f6bbbe..842b0340e1 100644
--- a/source/module_esolver/esolver_gets.cpp
+++ b/source/module_esolver/esolver_gets.cpp
@@ -147,7 +147,7 @@ void ESolver_GetS::runner(UnitCell& ucell, const int istep)
 }
 
 void ESolver_GetS::after_all_runners(UnitCell& ucell) {};
-double ESolver_GetS::cal_energy() {};
+double ESolver_GetS::cal_energy() { return 0.0; };
 void ESolver_GetS::cal_force(UnitCell& ucell, ModuleBase::matrix& force) {};
 void ESolver_GetS::cal_stress(UnitCell& ucell, ModuleBase::matrix& stress) {};
 
diff --git a/source/module_esolver/esolver_ks.h b/source/module_esolver/esolver_ks.h
index c20a53f555..16932bcc6a 100644
--- a/source/module_esolver/esolver_ks.h
+++ b/source/module_esolver/esolver_ks.h
@@ -43,7 +43,7 @@ class ESolver_KS : public ESolver_FP
     virtual void iter_init(UnitCell& ucell, const int istep, const int iter);
 
     //! Something to do after hamilt2density function in each iter loop.
-    virtual void iter_finish(UnitCell& ucell, const int istep, int& iter);
+    virtual void iter_finish(UnitCell& ucell, const int istep, int& iter) override;
 
     // calculate electron density from a specific Hamiltonian with ethr
     virtual void hamilt2density_single(UnitCell& ucell, const int istep, const int iter, const double ethr);