diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8777dc3..f1b8b66 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,11 +7,15 @@ include_directories("src")
 set(SRC_DIR "src/")
 set(TEST_DIR "tests/")
 
-set(READIMG_LIST
+set(IMAGE
 	${SRC_DIR}/bmp.c
 	${SRC_DIR}/transform.c
-	${TEST_DIR}/bmp.c
+	${SRC_DIR}/matrix.c
 	)
+add_library(image SHARED ${IMAGE})
 
-add_executable(bmp ${READIMG_LIST})
-
+set(IMAGE_TEST
+	${TEST_DIR}/bmp.c
+	)
+add_executable(bmp ${IMAGE_TEST})
+target_link_libraries(bmp image)
diff --git a/src/bmp.c b/src/bmp.c
index 67fd030..d8122a8 100644
--- a/src/bmp.c
+++ b/src/bmp.c
@@ -1,11 +1,5 @@
 #include "bmp.h"
 
-Matrix* init_matrix(){
-	Matrix* data = (Matrix*)malloc(sizeof(Matrix));
-	memset(data, 0, sizeof(Matrix));
-	return data;
-}
-
 Matrix* bmp_get_matrix(const char* image_path, Matrix* data_matrix){
 	size_t len_file_hdr = 0;
 	size_t len_info_hdr = 0;
@@ -170,21 +164,6 @@ Matrix* bmp_get_matrix(const char* image_path, Matrix* data_matrix){
 	return data_matrix;
 }
 
-void free_matrix(Matrix* data_matrix){
-	if (data_matrix->matrix != NULL)
-	{
-		free(data_matrix->matrix);
-		data_matrix->matrix = NULL;
-	}
-	
-	if (data_matrix != NULL)
-	{
-		free(data_matrix);
-		data_matrix = NULL;
-	}
-	
-}
-
 void bmp_info_print(const char* image_path){
 	size_t len_file_hdr = 0;
 	size_t len_info_hdr = 0;
diff --git a/src/bmp.h b/src/bmp.h
index f884b82..fb3e5ec 100644
--- a/src/bmp.h
+++ b/src/bmp.h
@@ -6,6 +6,7 @@
 #include "memory.h"
 #include "math.h"
 #include "matrix.h"
+#include "common.h"
 
 #pragma pack(push)
 #pragma pack(1)
@@ -42,30 +43,18 @@ typedef struct _RGBQUAD {
 
 #pragma pack(pop)
 
-/**
- * create and initial matrix
- * @return pointer of matrix
- */
-Matrix* init_matrix();
-
 /**
  * get matrix
  * @param  image_path  image file path
  * @param  data_matrix pointer of matrix
  * @return             pointer of matrix
  */
-Matrix* bmp_get_matrix(const char* image_path, Matrix* data_matrix);
-
-/**
- * free matrix
- * @param data_matrix pointer of matrix
- */
-void free_matrix(Matrix* data_matrix);
+iexp Matrix* bmp_get_matrix(const char* image_path, Matrix* data_matrix);
 
 /**
  * print the headers of bmp file
  * @param image_path file path
  */
-void bmp_info_print(const char* image_path);
+iexp void bmp_info_print(const char* image_path);
 
 #endif
diff --git a/src/common.h b/src/common.h
new file mode 100644
index 0000000..ae06de8
--- /dev/null
+++ b/src/common.h
@@ -0,0 +1,10 @@
+#ifndef _COMMON_H_
+#define _COMMON_H_
+
+#if defined _WIN32
+	#define iexp __declspec(dllexport) 
+#else
+# 	define iexp
+#endif
+
+#endif
\ No newline at end of file
diff --git a/src/matrix.c b/src/matrix.c
new file mode 100644
index 0000000..f3e1a44
--- /dev/null
+++ b/src/matrix.c
@@ -0,0 +1,22 @@
+#include "matrix.h"
+
+Matrix* init_matrix(){
+	Matrix* data = (Matrix*)malloc(sizeof(Matrix));
+	memset(data, 0, sizeof(Matrix));
+	return data;
+}
+
+void free_matrix(Matrix* data_matrix){
+	if (data_matrix->matrix != NULL)
+	{
+		free(data_matrix->matrix);
+		data_matrix->matrix = NULL;
+	}
+	
+	if (data_matrix != NULL)
+	{
+		free(data_matrix);
+		data_matrix = NULL;
+	}
+	
+}
diff --git a/src/matrix.h b/src/matrix.h
index 0064147..288fa96 100644
--- a/src/matrix.h
+++ b/src/matrix.h
@@ -1,6 +1,11 @@
 #ifndef _MATRIX_H_
 #define _MATRIX_H_
 
+#include "stdio.h"
+#include "stdlib.h"
+#include "memory.h"
+#include "common.h"
+
 #pragma pack(push)
 #pragma pack(1)
 
@@ -30,4 +35,16 @@ typedef struct _Matrix
 
 #pragma pack(pop)
 
+/**
+ * create and initial matrix
+ * @return pointer of matrix
+ */
+iexp Matrix* init_matrix();
+
+/**
+ * free matrix
+ * @param data_matrix pointer of matrix
+ */
+iexp void free_matrix(Matrix* data_matrix);
+
 #endif
diff --git a/src/transform.h b/src/transform.h
index a74a1f6..91d8e55 100644
--- a/src/transform.h
+++ b/src/transform.h
@@ -4,21 +4,21 @@
 #include "stdio.h"
 #include "stdlib.h"
 #include "memory.h"
-#include "math.h"
 #include "matrix.h"
+#include "common.h"
 
-void roll_x(Matrix* matrix);
+iexp void roll_x(Matrix* matrix);
 
-void roll_y(Matrix* matrix);
+iexp void roll_y(Matrix* matrix);
 
-void rotate_right(Matrix* matrix);
+iexp void rotate_right(Matrix* matrix);
 
-void rotate_left(Matrix* matrix);
+iexp void rotate_left(Matrix* matrix);
 
-void cut(size_t x1, size_t y1, size_t width, size_t height, Matrix* matrix);
+iexp void cut(size_t x1, size_t y1, size_t width, size_t height, Matrix* matrix);
 
-void zoom_in(Matrix* matrix);
+iexp void zoom_in(Matrix* matrix);
 
-void zoom_out(Matrix* matrix);
+iexp void zoom_out(Matrix* matrix);
 
 #endif