diff --git a/python/pyabacus/CMakeLists.txt b/python/pyabacus/CMakeLists.txt
index 399bd4fe57..0effbe83f2 100644
--- a/python/pyabacus/CMakeLists.txt
+++ b/python/pyabacus/CMakeLists.txt
@@ -12,9 +12,14 @@ set(BASE_PATH "${PROJECT_SOURCE_DIR}/../../source/module_base")
 set(ABACUS_SOURCE_DIR "${PROJECT_SOURCE_DIR}/../../source")
 include_directories(${BASE_PATH} ${ABACUS_SOURCE_DIR})
 list(APPEND _sources
-    ${ABACUS_SOURCE_DIR}/module_basis/module_nao/numerical_radial.h
-    ${ABACUS_SOURCE_DIR}/module_basis/module_nao/numerical_radial.cpp
-    ${PROJECT_SOURCE_DIR}/src/py_numerical_radial.cpp)
+    #${ABACUS_SOURCE_DIR}/module_basis/module_nao/numerical_radial.h
+    #${ABACUS_SOURCE_DIR}/module_basis/module_nao/numerical_radial.cpp
+    ${ABACUS_SOURCE_DIR}/module_base/constants.h
+    ${ABACUS_SOURCE_DIR}/module_base/math_sphbes.h
+    ${ABACUS_SOURCE_DIR}/module_base/math_sphbes.cpp
+    ${PROJECT_SOURCE_DIR}/src/py_abacus.cpp
+    #${PROJECT_SOURCE_DIR}/src/py_numerical_radial.cpp
+    ${PROJECT_SOURCE_DIR}/src/py_math_base.cpp)
 python_add_library(_core MODULE ${_sources} WITH_SOABI)
 target_link_libraries(_core PRIVATE pybind11::headers)
 target_compile_definitions(_core PRIVATE VERSION_INFO=${PROJECT_VERSION})
diff --git a/python/pyabacus/src/py_abacus.cpp b/python/pyabacus/src/py_abacus.cpp
new file mode 100644
index 0000000000..34b354dc6b
--- /dev/null
+++ b/python/pyabacus/src/py_abacus.cpp
@@ -0,0 +1,13 @@
+#include <pybind11/numpy.h>
+#include <pybind11/pybind11.h>
+
+namespace py = pybind11;
+
+void bind_numerical_radial(py::module& m);
+void bind_math_base(py::module& m);
+
+PYBIND11_MODULE(_core, m)
+{
+    // bind_numerical_radial(m);
+    bind_math_base(m);
+}
\ No newline at end of file
diff --git a/python/pyabacus/src/py_math_base.cpp b/python/pyabacus/src/py_math_base.cpp
new file mode 100644
index 0000000000..4378690897
--- /dev/null
+++ b/python/pyabacus/src/py_math_base.cpp
@@ -0,0 +1,63 @@
+#include <pybind11/numpy.h>
+#include <pybind11/pybind11.h>
+
+#include "module_base/math_sphbes.h"
+
+namespace py = pybind11;
+using namespace pybind11::literals;
+template <typename... Args>
+using overload_cast_ = pybind11::detail::overload_cast_impl<Args...>;
+
+void bind_math_base(py::module& m)
+{
+    py::module module_base = m.def_submodule("ModuleBase");
+
+    py::class_<ModuleBase::Sphbes>(module_base, "Sphbes")
+        .def(py::init<>())
+        .def_static("sphbesj", overload_cast_<const int, const double>()(&ModuleBase::Sphbes::sphbesj), "l"_a, "x"_a)
+        .def_static("dsphbesj", overload_cast_<const int, const double>()(&ModuleBase::Sphbes::dsphbesj), "l"_a, "x"_a)
+        .def_static("sphbesj",
+                    [](const int n, py::array_t<double> r, const double q, const int l, py::array_t<double> jl) {
+                        py::buffer_info r_info = r.request();
+                        if (r_info.ndim != 1)
+                        {
+                            throw std::runtime_error("r array must be 1-dimensional");
+                        }
+                        py::buffer_info jl_info = jl.request();
+                        if (jl_info.ndim != 1)
+                        {
+                            throw std::runtime_error("jl array must be 1-dimensional");
+                        }
+                        ModuleBase::Sphbes::sphbesj(n,
+                                                    static_cast<const double* const>(r_info.ptr),
+                                                    q,
+                                                    l,
+                                                    static_cast<double* const>(jl_info.ptr));
+                    })
+        .def_static("dsphbesj",
+                    [](const int n, py::array_t<double> r, const double q, const int l, py::array_t<double> djl) {
+                        py::buffer_info r_info = r.request();
+                        if (r_info.ndim != 1)
+                        {
+                            throw std::runtime_error("r array must be 1-dimensional");
+                        }
+                        py::buffer_info djl_info = djl.request();
+                        if (djl_info.ndim != 1)
+                        {
+                            throw std::runtime_error("djl array must be 1-dimensional");
+                        }
+                        ModuleBase::Sphbes::dsphbesj(n,
+                                                     static_cast<const double* const>(r_info.ptr),
+                                                     q,
+                                                     l,
+                                                     static_cast<double* const>(djl_info.ptr));
+                    })
+        .def_static("sphbes_zeros", [](const int l, const int n, py::array_t<double> zeros) {
+            py::buffer_info zeros_info = zeros.request();
+            if (zeros_info.ndim != 1)
+            {
+                throw std::runtime_error("zeros array must be 1-dimensional");
+            }
+            ModuleBase::Sphbes::sphbes_zeros(l, n, static_cast<double* const>(zeros_info.ptr));
+        });
+}
\ No newline at end of file
diff --git a/python/pyabacus/src/py_numerical_radial.cpp b/python/pyabacus/src/py_numerical_radial.cpp
index 296229b3d1..ebda8f080b 100644
--- a/python/pyabacus/src/py_numerical_radial.cpp
+++ b/python/pyabacus/src/py_numerical_radial.cpp
@@ -8,7 +8,7 @@ using namespace pybind11::literals;
 template <typename... Args>
 using overload_cast_ = pybind11::detail::overload_cast_impl<Args...>;
 
-PYBIND11_MODULE(_core, m)
+void bind_numerical_radial(py::module& m)
 {
     // Create the submodule for NumericalRadial
     py::module m_numerical_radial = m.def_submodule("NumericalRadial");
@@ -165,4 +165,4 @@ PYBIND11_MODULE(_core, m)
         .def_property_readonly("kgrid", overload_cast_<int>()(&NumericalRadial::kgrid, py::const_))
         .def_property_readonly("rvalue", overload_cast_<int>()(&NumericalRadial::rvalue, py::const_))
         .def_property_readonly("kvalue", overload_cast_<int>()(&NumericalRadial::kvalue, py::const_));
-}
+}
\ No newline at end of file
diff --git a/python/pyabacus/src/pyabacus/__init__.py b/python/pyabacus/src/pyabacus/__init__.py
index cda9318053..94d8c0d5b8 100644
--- a/python/pyabacus/src/pyabacus/__init__.py
+++ b/python/pyabacus/src/pyabacus/__init__.py
@@ -1,3 +1,4 @@
 from __future__ import annotations
-from ._core import __doc__, __version__, NumericalRadial
-__all__ = ["__doc__", "__version__", "NumericalRadial"]
\ No newline at end of file
+# from ._core import __doc__, __version__, NumericalRadial, ModuleBase
+from ._core import ModuleBase
+__all__ = ["ModuleBase"]
\ No newline at end of file
diff --git a/python/pyabacus/tests/test_base_math.py b/python/pyabacus/tests/test_base_math.py
new file mode 100644
index 0000000000..97d5118bac
--- /dev/null
+++ b/python/pyabacus/tests/test_base_math.py
@@ -0,0 +1,15 @@
+from __future__ import annotations
+
+import pyabacus as m
+import numpy as np
+
+
+def test_version():
+    assert m.__version__ == "0.0.1"
+
+def test_sphbes():
+    s = m.ModuleBase.Sphbes()
+    # test for sphbesj
+    assert s.sphbesj(1, 0.0) == 0.0
+    assert s.sphbesj(0, 0.0) == 1.0
+
diff --git a/python/pyabacus/tests/test_nr.py b/python/pyabacus/tests/test_nr.py
deleted file mode 100644
index 4986331b25..0000000000
--- a/python/pyabacus/tests/test_nr.py
+++ /dev/null
@@ -1,25 +0,0 @@
-from __future__ import annotations
-
-import pyabacus as m
-
-
-def test_version():
-    assert m.__version__ == "0.0.1"
-
-def test_attributes():
-    chi = m.NumericalRadial()
-    # string
-    assert chi.symbol == ''
-    # integer
-    assert chi.itype == 0
-    assert chi.izeta == 0
-    assert chi.l == -1
-    assert chi.nr == 0
-    assert chi.nk == 0
-    # float
-    assert chi.rcut == 0.0
-    assert chi.kcut == 0.0
-    assert chi.pr == 0.0
-    assert chi.pk == 0.0
-    # bool
-    assert chi.is_fft_compliant == False
diff --git a/source/module_base/math_sphbes.cpp b/source/module_base/math_sphbes.cpp
index 5e7f41de54..3659679fa3 100644
--- a/source/module_base/math_sphbes.cpp
+++ b/source/module_base/math_sphbes.cpp
@@ -1,7 +1,7 @@
 #include "math_sphbes.h"
-#include "timer.h"
 #include "constants.h"
 #include <algorithm>
+#include <iostream>
 
 #include <cassert>
 
@@ -425,7 +425,6 @@ void Sphbes::Spherical_Bessel
     double *jl		 // jl(1:msh) = j_l(q*r(i)),spherical bessel function
 )
 {
-    ModuleBase::timer::tick("Sphbes","Spherical_Bessel");
     double x1=0.0;
 
     int i=0;
@@ -598,7 +597,6 @@ void Sphbes::Spherical_Bessel
         }
     }
 
-    ModuleBase::timer::tick("Sphbes","Spherical_Bessel");
     return;
 }
 
@@ -613,7 +611,6 @@ void Sphbes::Spherical_Bessel
 	double *sjp
 )
 {
-	ModuleBase::timer::tick("Sphbes","Spherical_Bessel");
 
 	//calculate jlx first
 	Spherical_Bessel (msh, r, q, l, sj);
@@ -634,7 +631,6 @@ void Sphbes::dSpherical_Bessel_dx
     double *djl		 // jl(1:msh) = j_l(q*r(i)),spherical bessel function
 )
 {
-    ModuleBase::timer::tick("Sphbes","dSpherical_Bessel_dq");
     if (l < 0 )
     {
 		std::cout << "We temporarily only calculate derivative of l >= 0." << std::endl;
@@ -682,7 +678,6 @@ void Sphbes::dSpherical_Bessel_dx
         }
         delete[] jl;
     }
-    ModuleBase::timer::tick("Sphbes","dSpherical_Bessel_dq");
     return;
 }