diff --git a/source/source_base/element_basis_index.cpp b/source/source_base/element_basis_index.cpp
index 1130de59e3..32eafd01e1 100644
--- a/source/source_base/element_basis_index.cpp
+++ b/source/source_base/element_basis_index.cpp
@@ -4,24 +4,26 @@
 //==========================================================
 
 #include "element_basis_index.h"
+
 namespace ModuleBase
 {
 
-Element_Basis_Index::IndexLNM Element_Basis_Index::construct_index( const Range &range )
+Element_Basis_Index::IndexLNM
+Element_Basis_Index::construct_index( const Range &range )
 {
 	IndexLNM index;
 	index.resize( range.size() );
-	for( size_t T=0; T!=range.size(); ++T )
+	for( std::size_t T=0; T!=range.size(); ++T )
 	{
-		size_t count=0;
+		std::size_t count=0;
 		index[T].resize( range[T].size() );
-		for( size_t L=0; L!=range[T].size(); ++L )
+		for( std::size_t L=0; L!=range[T].size(); ++L )
 		{
 			index[T][L].resize( range[T][L].N );
-			for( size_t N=0; N!=range[T][L].N; ++N )
+			for( std::size_t N=0; N!=range[T][L].N; ++N )
 			{
 				index[T][L][N].resize( range[T][L].M );
-				for( size_t M=0; M!=range[T][L].M; ++M )
+				for( std::size_t M=0; M!=range[T][L].M; ++M )
 				{
 					index[T][L][N][M] = count;
 					++count;
diff --git a/source/source_base/element_basis_index.h b/source/source_base/element_basis_index.h
index 96918b8e03..bb81ebf40e 100644
--- a/source/source_base/element_basis_index.h
+++ b/source/source_base/element_basis_index.h
@@ -8,40 +8,41 @@
 
 #include <cstddef>
 #include <vector>
+
 namespace ModuleBase
 {
 
-class Element_Basis_Index
+namespace Element_Basis_Index
 {
-private:
-	
+  //private:
+
 	struct NM
 	{
 		public:
-		size_t N;
-		size_t M;
+		std::size_t N;
+		std::size_t M;
 	};
-	
-	class Index_TL: public std::vector<std::vector<size_t>>
+
+	class Index_TL: public std::vector<std::vector<std::size_t>>
 	{
 		public:
-		size_t N;
-		size_t M;
+		std::size_t N;
+		std::size_t M;
 	};
-	
+
 	class Index_T: public std::vector<Index_TL>
 	{
 		public:
-		size_t count_size;
-	};	
-	
-public:
-	
-	typedef std::vector<std::vector<NM>> Range; 								// range[T][L]
+		std::size_t count_size;
+	};
+
+  //public:
+
+	typedef std::vector<std::vector<NM>> Range; 						// range[T][L]
 	typedef std::vector<Index_T> IndexLNM;								// index[T][L][N][M]
-	
-	static IndexLNM construct_index( const Range &range );
-};
+
+	extern IndexLNM construct_index( const Range &range );
+}
 
 }
 
diff --git a/source/source_basis/module_ao/CMakeLists.txt b/source/source_basis/module_ao/CMakeLists.txt
index e19a5ba34d..bdc18b0d45 100644
--- a/source/source_basis/module_ao/CMakeLists.txt
+++ b/source/source_basis/module_ao/CMakeLists.txt
@@ -9,6 +9,7 @@ if(ENABLE_LCAO)
       ORB_nonlocal_lm.cpp
       ORB_read.cpp
       parallel_orbitals.cpp
+      element_basis_index-ORB.cpp
   )
 
   if(ENABLE_COVERAGE)
diff --git a/source/source_basis/module_ao/element_basis_index-ORB.cpp b/source/source_basis/module_ao/element_basis_index-ORB.cpp
new file mode 100644
index 0000000000..c9441b4497
--- /dev/null
+++ b/source/source_basis/module_ao/element_basis_index-ORB.cpp
@@ -0,0 +1,44 @@
+#include "element_basis_index-ORB.h"
+
+#include "ORB_read.h"
+#include "ORB_atomic_lm.h"
+
+namespace ModuleBase
+{
+
+ModuleBase::Element_Basis_Index::Range
+Element_Basis_Index::construct_range( const LCAO_Orbitals &orb )
+{
+	ModuleBase::Element_Basis_Index::Range range;
+	range.resize( orb.get_ntype() );
+	for( std::size_t T=0; T!=range.size(); ++T )
+	{
+		range[T].resize( orb.Phi[T].getLmax()+1 );
+		for( std::size_t L=0; L!=range[T].size(); ++L )
+		{
+			range[T][L].N = orb.Phi[T].getNchi(L);
+			range[T][L].M = 2*L+1;
+		}
+	}
+	return range;
+}
+
+
+ModuleBase::Element_Basis_Index::Range
+Element_Basis_Index::construct_range( const std::vector<std::vector<std::vector<Numerical_Orbital_Lm>>> &orb )
+{
+	ModuleBase::Element_Basis_Index::Range range;
+	range.resize( orb.size() );
+	for( std::size_t T=0; T!=range.size(); ++T )
+	{
+		range[T].resize( orb[T].size() );
+		for( std::size_t L=0; L!=range[T].size(); ++L )
+		{
+			range[T][L].N = orb[T][L].size();
+			range[T][L].M = 2*L+1;
+		}
+	}
+	return range;
+}
+
+}
\ No newline at end of file
diff --git a/source/source_basis/module_ao/element_basis_index-ORB.h b/source/source_basis/module_ao/element_basis_index-ORB.h
new file mode 100644
index 0000000000..ec2415e6a0
--- /dev/null
+++ b/source/source_basis/module_ao/element_basis_index-ORB.h
@@ -0,0 +1,22 @@
+#ifndef ELEMENT_BASIS_INDEX_ORB_H
+#define ELEMENT_BASIS_INDEX_ORB_H
+
+#include "../../source_base/element_basis_index.h"
+#include <vector>
+
+	class Numerical_Orbital_Lm;
+	class LCAO_Orbitals;
+
+namespace ModuleBase
+{
+
+namespace Element_Basis_Index
+{
+	extern Range construct_range( const LCAO_Orbitals &orb );
+
+	extern Range construct_range( const std::vector<std::vector<std::vector<Numerical_Orbital_Lm>>> &orb );		// orb[T][L][N]
+}
+
+}
+
+#endif
\ No newline at end of file
diff --git a/source/source_esolver/esolver_ks_lcao.h b/source/source_esolver/esolver_ks_lcao.h
index 67ca7a0482..9e85336893 100644
--- a/source/source_esolver/esolver_ks_lcao.h
+++ b/source/source_esolver/esolver_ks_lcao.h
@@ -103,6 +103,24 @@ class ESolver_KS_LCAO : public ESolver_KS<TK>
 
     friend class LR::ESolver_LR<double, double>;
     friend class LR::ESolver_LR<std::complex<double>, double>;
+
+
+  public:
+    const Record_adj & get_RA() const { return RA; }
+    const Grid_Driver & get_gd() const { return gd; }
+    const Parallel_Orbitals & get_pv() const { return pv; }
+    const Gint_k & get_GK() const { return GK; }
+    const Gint_Gamma & get_GG() const { return GG; }
+    const Grid_Technique & get_GridT() const { return GridT; }
+  #ifndef __OLD_GINT
+    const std::unique_ptr<ModuleGint::GintInfo> & get_gint_info() const { return gint_info_; }
+  #endif
+    const TwoCenterBundle & get_two_center_bundle() const { return two_center_bundle_; }
+    const rdmft::RDMFT<TK, TR> & get_rdmft_solver() const { return rdmft_solver; }
+    const LCAO_Orbitals & get_orb() const { return orb_; }
+    const ModuleBase::matrix & get_scs() const { return scs; }
+    const Setup_DeePKS<TK> & get_deepks() const { return deepks; }
+    const Exx_NAO<TK> & get_exx_nao() const { return exx_nao; }
 };
 } // namespace ModuleESolver
 #endif
diff --git a/source/source_lcao/hamilt_lcao.h b/source/source_lcao/hamilt_lcao.h
index 3a0a41eb7e..7e888ded3d 100644
--- a/source/source_lcao/hamilt_lcao.h
+++ b/source/source_lcao/hamilt_lcao.h
@@ -105,12 +105,20 @@ class HamiltLCAO : public Hamilt<TK>
     {
         return this->hR;
     }
+    const HContainer<TR>* getHR() const
+    {
+        return this->hR;
+    }
 
     /// get SR pointer of *this->sR, which is a HContainer<TR> and contains S(R)
     HContainer<TR>*& getSR()
     {
         return this->sR;
     }
+    const HContainer<TR>* getSR() const
+    {
+        return this->sR;
+    }
 
 #ifdef __MLALGO
     /// get V_delta_R pointer of *this->V_delta_R, which is a HContainer<TR> and contains V_delta(R)
diff --git a/source/source_lcao/module_ri/ABFs_Construct-PCA.cpp b/source/source_lcao/module_ri/ABFs_Construct-PCA.cpp
index 9c944f77db..b96ad3169e 100644
--- a/source/source_lcao/module_ri/ABFs_Construct-PCA.cpp
+++ b/source/source_lcao/module_ri/ABFs_Construct-PCA.cpp
@@ -1,9 +1,8 @@
 #include "ABFs_Construct-PCA.h"
 
-#include "exx_abfs-abfs_index.h"
 #include "../../source_base/module_external/lapack_connector.h"
 #include "../../source_base/global_function.h"
-#include "../../source_base/element_basis_index.h"
+#include "../../source_basis/module_ao/element_basis_index-ORB.h"
 #include "../../source_base/matrix.h"
 #include "../../source_lcao/module_ri/Matrix_Orbs11.h"
 #include "../../source_lcao/module_ri/Matrix_Orbs21.h"
@@ -81,12 +80,12 @@ namespace PCA
 		ModuleBase::TITLE("ABFs_Construct::PCA::cal_PCA");
 		
 		const ModuleBase::Element_Basis_Index::Range
-			range_lcaos = Exx_Abfs::Abfs_Index::construct_range( lcaos );
+			range_lcaos = ModuleBase::Element_Basis_Index::construct_range( lcaos );
 		const ModuleBase::Element_Basis_Index::IndexLNM
 			index_lcaos = ModuleBase::Element_Basis_Index::construct_index( range_lcaos );
 
 		const ModuleBase::Element_Basis_Index::Range
-			range_abfs = Exx_Abfs::Abfs_Index::construct_range( abfs );
+			range_abfs = ModuleBase::Element_Basis_Index::construct_range( abfs );
 		const ModuleBase::Element_Basis_Index::IndexLNM
 			index_abfs = ModuleBase::Element_Basis_Index::construct_index( range_abfs );
 
diff --git a/source/source_lcao/module_ri/CMakeLists.txt b/source/source_lcao/module_ri/CMakeLists.txt
index 65ab0d12f9..62cdede596 100644
--- a/source/source_lcao/module_ri/CMakeLists.txt
+++ b/source/source_lcao/module_ri/CMakeLists.txt
@@ -14,7 +14,6 @@ if (ENABLE_LIBRI)
   if(ENABLE_LCAO)
     list(APPEND objects
         conv_coulomb_pot_k.cpp
-        exx_abfs-abfs_index.cpp
         exx_abfs-construct_orbs.cpp
         exx_abfs-io.cpp
         exx_abfs-jle.cpp
diff --git a/source/source_lcao/module_ri/LRI_CV.hpp b/source/source_lcao/module_ri/LRI_CV.hpp
index b97ac9ed5e..c3a7177147 100644
--- a/source/source_lcao/module_ri/LRI_CV.hpp
+++ b/source/source_lcao/module_ri/LRI_CV.hpp
@@ -8,9 +8,9 @@
 
 #include "LRI_CV.h"
 #include "LRI_CV_Tools.h"
-#include "exx_abfs-abfs_index.h"
 #include "exx_abfs-construct_orbs.h"
 #include "RI_Util.h"
+#include "../../source_basis/module_ao/element_basis_index-ORB.h"
 #include "../../source_base/tool_title.h"
 #include "../../source_base/timer.h"
 #include "../../source_pw/module_pwdft/global.h"
@@ -62,11 +62,11 @@ void LRI_CV<Tdata>::set_orbitals(
         = Exx_Abfs::Construct_Orbs::get_Rmax(this->abfs_ccp);
 
 	const ModuleBase::Element_Basis_Index::Range
-		range_lcaos = Exx_Abfs::Abfs_Index::construct_range( lcaos );
+		range_lcaos = ModuleBase::Element_Basis_Index::construct_range( lcaos );
 	this->index_lcaos = ModuleBase::Element_Basis_Index::construct_index( range_lcaos );
 
 	const ModuleBase::Element_Basis_Index::Range
-		range_abfs = Exx_Abfs::Abfs_Index::construct_range( abfs );
+		range_abfs = ModuleBase::Element_Basis_Index::construct_range( abfs );
 	this->index_abfs = ModuleBase::Element_Basis_Index::construct_index( range_abfs );
 
     int Lmax_v = std::numeric_limits<double>::min();
diff --git a/source/source_lcao/module_ri/exx_abfs-abfs_index.cpp b/source/source_lcao/module_ri/exx_abfs-abfs_index.cpp
deleted file mode 100644
index 9826afd63f..0000000000
--- a/source/source_lcao/module_ri/exx_abfs-abfs_index.cpp
+++ /dev/null
@@ -1,37 +0,0 @@
-#include "exx_abfs-abfs_index.h"
-#include "../../source_basis/module_ao/ORB_read.h"
-
-ModuleBase::Element_Basis_Index::Range
-	Exx_Abfs::Abfs_Index::construct_range( const LCAO_Orbitals &orb )
-{
-	ModuleBase::Element_Basis_Index::Range range;
-	range.resize( orb.get_ntype() );
-	for( size_t T=0; T!=range.size(); ++T )
-	{
-		range[T].resize( orb.Phi[T].getLmax()+1 );
-		for( size_t L=0; L!=range[T].size(); ++L )
-		{
-			range[T][L].N = orb.Phi[T].getNchi(L);
-			range[T][L].M = 2*L+1;
-		}
-	}
-	return range;
-}
-
-
-ModuleBase::Element_Basis_Index::Range
-	Exx_Abfs::Abfs_Index::construct_range( const std::vector<std::vector<std::vector<Numerical_Orbital_Lm>>> &orb )
-{
-	ModuleBase::Element_Basis_Index::Range range;
-	range.resize( orb.size() );
-	for( size_t T=0; T!=range.size(); ++T )
-	{
-		range[T].resize( orb[T].size() );
-		for( size_t L=0; L!=range[T].size(); ++L )
-		{
-			range[T][L].N = orb[T][L].size();	
-			range[T][L].M = 2*L+1;	
-		}			
-	}
-	return range;
-}
diff --git a/source/source_lcao/module_ri/exx_abfs-abfs_index.h b/source/source_lcao/module_ri/exx_abfs-abfs_index.h
deleted file mode 100644
index 40dce3c5c6..0000000000
--- a/source/source_lcao/module_ri/exx_abfs-abfs_index.h
+++ /dev/null
@@ -1,19 +0,0 @@
-#ifndef EXX_ABFS_ABFS_INDEX_H
-#define EXX_ABFS_ABFS_INDEX_H
-
-#include "exx_abfs.h"
-
-#include <vector>
-#include "../../source_base/element_basis_index.h"
-#include "../../source_basis/module_ao/ORB_atomic_lm.h"
-
-class LCAO_Orbitals;
-
-class Exx_Abfs::Abfs_Index
-{
-public:
-	static ModuleBase::Element_Basis_Index::Range construct_range( const LCAO_Orbitals &orb );	
-	static ModuleBase::Element_Basis_Index::Range construct_range( const std::vector<std::vector<std::vector<Numerical_Orbital_Lm>>> &orb );
-};
-
-#endif	// EXX_ABFS_ABFS_INDEX_H
\ No newline at end of file
diff --git a/source/source_lcao/module_ri/exx_abfs-io.cpp b/source/source_lcao/module_ri/exx_abfs-io.cpp
index 78184e1c52..3a8de0f1b3 100644
--- a/source/source_lcao/module_ri/exx_abfs-io.cpp
+++ b/source/source_lcao/module_ri/exx_abfs-io.cpp
@@ -4,7 +4,6 @@
 
 #include "exx_abfs-io.h"
 #include "exx_abfs-jle.h"
-#include "exx_abfs-abfs_index.h"
 #include "../../source_pw/module_pwdft/global.h"
 #include "../../source_basis/module_ao/ORB_read.h"
 #include "../../source_base/global_function.h"
diff --git a/source/source_lcao/module_ri/exx_abfs.h b/source/source_lcao/module_ri/exx_abfs.h
index bda52e69d2..f08462c94e 100644
--- a/source/source_lcao/module_ri/exx_abfs.h
+++ b/source/source_lcao/module_ri/exx_abfs.h
@@ -15,7 +15,6 @@ using std::map;
 class Exx_Abfs
 {
 public:
-	class Abfs_Index;
 	class Jle;
 	class IO;
 	class Construct_Orbs;
diff --git a/source/source_lcao/module_ri/exx_opt_orb.cpp b/source/source_lcao/module_ri/exx_opt_orb.cpp
index 6623ca91e1..f36d65249d 100644
--- a/source/source_lcao/module_ri/exx_opt_orb.cpp
+++ b/source/source_lcao/module_ri/exx_opt_orb.cpp
@@ -2,10 +2,10 @@
 #include "source_pw/module_pwdft/global.h"
 #include "source_basis/module_ao/ORB_atomic_lm.h"
 #include "exx_abfs.h"
-#include "exx_abfs-abfs_index.h"
 #include "exx_abfs-construct_orbs.h"
 #include "exx_abfs-io.h"
 #include "exx_abfs-jle.h"
+#include "source_basis/module_ao/element_basis_index-ORB.h"
 #include "source_basis/module_ao/ORB_read.h"
 #include "source_lcao/module_ri/Matrix_Orbs11.h"
 #include "source_lcao/module_ri/Matrix_Orbs21.h"
@@ -53,13 +53,13 @@ void Exx_Opt_Orb::generate_matrix(
 	for(const auto &orb_T : jle)
 		{ GlobalC::exx_info.info_ri.abfs_Lmax = std::max( GlobalC::exx_info.info_ri.abfs_Lmax, static_cast<int>(orb_T.size())-1 ); }
 
-	const ModuleBase::Element_Basis_Index::Range    range_lcaos = Exx_Abfs::Abfs_Index::construct_range( lcaos );
+	const ModuleBase::Element_Basis_Index::Range    range_lcaos = ModuleBase::Element_Basis_Index::construct_range( lcaos );
 	const ModuleBase::Element_Basis_Index::IndexLNM index_lcaos = ModuleBase::Element_Basis_Index::construct_index( range_lcaos );
 
-	const ModuleBase::Element_Basis_Index::Range    range_abfs = Exx_Abfs::Abfs_Index::construct_range( abfs );
+	const ModuleBase::Element_Basis_Index::Range    range_abfs = ModuleBase::Element_Basis_Index::construct_range( abfs );
 	const ModuleBase::Element_Basis_Index::IndexLNM index_abfs = ModuleBase::Element_Basis_Index::construct_index( range_abfs );
 
-	const ModuleBase::Element_Basis_Index::Range    range_jys = Exx_Abfs::Abfs_Index::construct_range( jle );
+	const ModuleBase::Element_Basis_Index::Range    range_jys = ModuleBase::Element_Basis_Index::construct_range( jle );
 	const ModuleBase::Element_Basis_Index::IndexLNM index_jys = ModuleBase::Element_Basis_Index::construct_index( range_jys );
 
 	Exx_Abfs::Construct_Orbs::print_orbs_size(ucell, abfs, GlobalV::ofs_running);