diff --git a/CMakeLists.txt b/CMakeLists.txt
index a89a7b6..e7f98fe 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -98,7 +98,6 @@ endif()
 
 if(GCTL_FOUND AND GCTL_OPTIMIZATION_FOUND)
     add_example(optimization lcg_solver_ex ON OFF ON OFF)
-    add_example(optimization geoblas_lcg_solver_ex ON OFF ON OFF)
     add_example(optimization lgd_solver_ex ON OFF ON OFF)
     add_example(optimization ex3 ON OFF ON OFF)
     add_example(optimization ex4 ON OFF ON OFF)
diff --git a/src/optimization/geoblas_lcg_solver_ex.cpp b/src/optimization/geoblas_lcg_solver_ex.cpp
deleted file mode 100644
index 978c53c..0000000
--- a/src/optimization/geoblas_lcg_solver_ex.cpp
+++ /dev/null
@@ -1,114 +0,0 @@
-/********************************************************
- *  ██████╗  ██████╗████████╗██╗
- * ██╔════╝ ██╔════╝╚══██╔══╝██║
- * ██║  ███╗██║        ██║   ██║
- * ██║   ██║██║        ██║   ██║
- * ╚██████╔╝╚██████╗   ██║   ███████╗
- *  ╚═════╝  ╚═════╝   ╚═╝   ╚══════╝
- * Geophysical Computational Tools & Library (GCTL)
- *
- * Copyright (c) 2022  Yi Zhang (yizhang-geo@zju.edu.cn)
- *
- * GCTL is distributed under a dual licensing scheme. You can redistribute 
- * it and/or modify it under the terms of the GNU Lesser General Public 
- * License as published by the Free Software Foundation, either version 2 
- * of the License, or (at your option) any later version. You should have 
- * received a copy of the GNU Lesser General Public License along with this 
- * program. If not, see <http://www.gnu.org/licenses/>.
- * 
- * If the terms and conditions of the LGPL v.2. would prevent you from using 
- * the GCTL, please consider the option to obtain a commercial license for a 
- * fee. These licenses are offered by the GCTL's original author. As a rule, 
- * licenses are provided "as-is", unlimited in time for a one time fee. Please 
- * send corresponding requests to: yizhang-geo@zju.edu.cn. Please do not forget 
- * to include some description of your company and the realm of its activities. 
- * Also add information on how to contact you by electronic and paper mail.
- ******************************************************/
-
-#include "gctl/core/array_algorithm.h"
-#include "gctl/core/matrix_algorithm.h"
-#include "gctl/optimization/lcg_geoblas.h"
-
-#define M 1000
-#define N 800
-
-double max_diff(const gctl::array<double> &a, const gctl::array<double> &b)
-{
-	double max = -1.0;
-	for (size_t i = 0; i < a.size(); i++)
-	{
-		max = std::max(sqrt((a[i] - b[i])*(a[i] - b[i])), max);
-	}
-	return max;
-}
-
-class ex1 : public gctl::geoblas_lcg_solver
-{
-public:
-	ex1();
-	virtual ~ex1();
-
-	// 计算共轭梯度的B项
-	void cal_partb(const geoblas_vec_t dx, geoblas_vec_t dB);
-
-	//定义共轭梯度中Ax的算法
-	virtual void LCG_Ax(const geoblas_vec_t x, geoblas_vec_t ax);
-
-private:
-	geoblas_mat_t d_kernel; // 普通二维数组做核矩阵
-	geoblas_vec_t d_tmp; // 中间结果数组
-
-	gctl::matrix<double> h_kernel;
-};
-
-ex1::ex1()
-{
-	h_kernel.resize(M, N);
-	random_float(h_kernel, -1.0, 1.0, gctl::RdUniform);
-
-	d_kernel = geoblas_mat_new(M, N);
-	d_tmp = geoblas_vec_new(M);
-
-	geoblas_put_mat_data(d_kernel, h_kernel.get());
-}
-
-ex1::~ex1()
-{
-	geoblas_mat_free(d_kernel);
-	geoblas_vec_free(d_tmp);
-}
-
-void ex1::cal_partb(const geoblas_vec_t dx, geoblas_vec_t dB)
-{
-	LCG_Ax(dx, dB);
-	return;
-}
-
-void ex1::LCG_Ax(const geoblas_vec_t x, geoblas_vec_t ax)
-{
-	geoblas_gemv('N', M, N, 1.0, d_kernel, x, 0.0, d_tmp);
-	geoblas_gemv('T', M, N, 1.0, d_kernel, d_tmp, 0.0, ax);
-	return;
-}
-
-int main(int argc, char const *argv[])
-{
-	ex1 test;
-
-	gctl::array<double> m(N, 0.0);
-	gctl::array<double> fm(N);
-	random_float(fm, 1.0, 2.0, gctl::RdUniform);
-
-	geoblas_vec_t dfm = geoblas_vec_new(N);
-	geoblas_vec_t dm = geoblas_vec_new(N);
-	geoblas_vec_t dB = geoblas_vec_new(N);
-	geoblas_put_vec_data(dfm, fm.get());
-	geoblas_put_vec_data(dm, m.get());
-
-	test.cal_partb(dfm, dB);
-	test.lcg(dm, dB);
-
-	geoblas_get_vec_data(dm, m.get());
-	std::cout << "max-diff = " << max_diff(fm , m) << "\n";
-	return 0;
-}
\ No newline at end of file