diff --git a/docs/advanced/elec_properties/Berry_phase.md b/docs/advanced/elec_properties/Berry_phase.md
index 9dbe47ba90..7f85689a5f 100644
--- a/docs/advanced/elec_properties/Berry_phase.md
+++ b/docs/advanced/elec_properties/Berry_phase.md
@@ -23,7 +23,7 @@ pseudo_dir      ../../../tests/PP_ORB  //the path to locate the pesudopotential
 orbital_dir     ../../../tests/PP_ORB  //the path to locate the numerical orbital files
 ntype         3
 ecutwfc       50 // Ry
-symmetry      0 // turn off symmetry
+symmetry      -1 // turn off symmetry
 calculation   nscf // non-self-consistent calculation
 basis_type    lcao // atomic basis
 init_chg  file // read charge from files
@@ -70,4 +70,6 @@ The results are shown as follows:
  P =    0.8906925  (mod    2.1748536)  (   0.0000000,   0.0000000,   0.8906925) C/m^2
 ```
 
-The electric polarization **P** is multivalued, which modulo a quantum e**R**/V~cell~. Note: the values in parentheses are the components of the **P** along the c axis in the x, y, z Cartesian coordinates when set gdir = 3 in INPUT file.
\ No newline at end of file
+The electric polarization **P** is multivalued, which modulo a quantum e**R**/V~cell~. 
+
+Note: The vectors R1, R2, and R3 refer to the three lattice vectors of the unit cell. When gdir=3, the calculated polarization is along the R3 direction. The three values in parentheses represent the re-projection of the polarization along the R3 direction onto the Cartesian coordinate system (i.e., the xyz coordinate system). To obtain the full polarization components in the Cartesian system, you need to calculate the polarization for R1, R2, and R3 separately, and then sum their respective x, y, and z components.
diff --git a/examples/berryphase/lcao_PbTiO3/INPUT-nscf-a b/examples/berryphase/lcao_PbTiO3/INPUT-nscf-a
index 4fe797dada..97520e857e 100644
--- a/examples/berryphase/lcao_PbTiO3/INPUT-nscf-a
+++ b/examples/berryphase/lcao_PbTiO3/INPUT-nscf-a
@@ -3,7 +3,7 @@ pseudo_dir              ../../../tests/PP_ORB
 orbital_dir             ../../../tests/PP_ORB
 ntype       		3
 ecutwfc     		50
-symmetry    		0
+symmetry    		-1
 calculation 		nscf
 basis_type  		lcao
 init_chg  		file
diff --git a/examples/berryphase/lcao_PbTiO3/INPUT-nscf-b b/examples/berryphase/lcao_PbTiO3/INPUT-nscf-b
index 637b9aa533..22e02eddba 100644
--- a/examples/berryphase/lcao_PbTiO3/INPUT-nscf-b
+++ b/examples/berryphase/lcao_PbTiO3/INPUT-nscf-b
@@ -3,7 +3,7 @@ pseudo_dir              ../../../tests/PP_ORB
 orbital_dir             ../../../tests/PP_ORB
 ntype       		3
 ecutwfc     		50
-symmetry    		0
+symmetry    		-1
 calculation 		nscf
 basis_type  		lcao
 init_chg  		file
diff --git a/examples/berryphase/lcao_PbTiO3/INPUT-nscf-c b/examples/berryphase/lcao_PbTiO3/INPUT-nscf-c
index 426b111e61..b2cdf5958e 100644
--- a/examples/berryphase/lcao_PbTiO3/INPUT-nscf-c
+++ b/examples/berryphase/lcao_PbTiO3/INPUT-nscf-c
@@ -3,7 +3,7 @@ pseudo_dir              ../../../tests/PP_ORB
 orbital_dir             ../../../tests/PP_ORB
 ntype       		3
 ecutwfc     		50
-symmetry    		0
+symmetry    		-1
 calculation 		nscf
 basis_type  		lcao
 init_chg  		file
diff --git a/examples/berryphase/pw_PbTiO3/INPUT-nscf-a b/examples/berryphase/pw_PbTiO3/INPUT-nscf-a
index 23fc9549fc..c344e9ff15 100644
--- a/examples/berryphase/pw_PbTiO3/INPUT-nscf-a
+++ b/examples/berryphase/pw_PbTiO3/INPUT-nscf-a
@@ -2,7 +2,7 @@ INPUT_PARAMETERS
 pseudo_dir              ../../../tests/PP_ORB
 ntype                   3
 ecutwfc                 50
-symmetry                0
+symmetry                -1
 pw_diag_thr             1e-10
 calculation             nscf
 basis_type              pw
diff --git a/examples/berryphase/pw_PbTiO3/INPUT-nscf-b b/examples/berryphase/pw_PbTiO3/INPUT-nscf-b
index a59e92149c..ef6c1984c7 100644
--- a/examples/berryphase/pw_PbTiO3/INPUT-nscf-b
+++ b/examples/berryphase/pw_PbTiO3/INPUT-nscf-b
@@ -2,7 +2,7 @@ INPUT_PARAMETERS
 pseudo_dir              ../../../tests/PP_ORB
 ntype                   3
 ecutwfc                 50
-symmetry                0
+symmetry                -1
 pw_diag_thr             1e-10
 calculation             nscf
 basis_type              pw
diff --git a/examples/berryphase/pw_PbTiO3/INPUT-nscf-c b/examples/berryphase/pw_PbTiO3/INPUT-nscf-c
index fdc68d69a3..2242ff889e 100644
--- a/examples/berryphase/pw_PbTiO3/INPUT-nscf-c
+++ b/examples/berryphase/pw_PbTiO3/INPUT-nscf-c
@@ -2,7 +2,7 @@ INPUT_PARAMETERS
 pseudo_dir              ../../../tests/PP_ORB
 ntype                   3
 ecutwfc                 50
-symmetry                0
+symmetry                -1
 pw_diag_thr             1e-10
 calculation             nscf
 basis_type              pw
diff --git a/source/module_io/read_input_item_postprocess.cpp b/source/module_io/read_input_item_postprocess.cpp
index 411214fe6c..1087e24d95 100644
--- a/source/module_io/read_input_item_postprocess.cpp
+++ b/source/module_io/read_input_item_postprocess.cpp
@@ -130,6 +130,10 @@ void ReadInput::item_postprocess()
                 {
                     ModuleBase::WARNING_QUIT("ReadInput", "calculate berry phase, please set gdir = 1 or 2 or 3");
                 }
+                if (para.input.symmetry != "-1")
+                {
+                    ModuleBase::WARNING_QUIT("ReadInput", "calculate berry phase, please set symmetry = -1");
+                }
             }
         };
         this->add_item(item);