diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index d961439..523a18c 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -15,7 +15,7 @@ project(${APP_NAME}
     LANGUAGES C
 )
 
-add_executable(${APP_NAME} main.c utils.c)
+add_executable(${APP_NAME} main.c utils.c config.c)
 
 # use C17
 set_property(TARGET ${APP_NAME} PROPERTY C_STANDARD 17)
@@ -24,6 +24,7 @@ target_include_directories(${APP_NAME} PRIVATE "${SOURCE_DIR}/include")
 
 find_package(PkgConfig REQUIRED)
 
+pkg_check_modules(GLIB REQUIRED glib-2.0)
 pkg_check_modules(XCB REQUIRED
     xcb
     xcb-cursor
@@ -35,10 +36,18 @@ pkg_check_modules(XCB REQUIRED
     xcb-xinerama
     xcb-xrm
 )
-target_include_directories(${APP_NAME} SYSTEM PUBLIC ${XCB_INCLUDE_DIRS})
+
+target_include_directories(${APP_NAME} SYSTEM PUBLIC
+    ${GLIB_INCLUDE_DIRS}
+    ${XCB_INCLUDE_DIRS}
+)
 
 add_subdirectory(xcb)
-target_link_libraries(${APP_NAME} ${LIB_XCB_NAME})
+
+target_link_libraries(${APP_NAME}
+    ${GLIB_LIBRARIES}
+    ${LIB_XCB_NAME}
+)
 
 configure_file(
     "${CMAKE_CURRENT_SOURCE_DIR}/app.h.in"
diff --git a/src/config.c b/src/config.c
new file mode 100644
index 0000000..d0b18c2
--- /dev/null
+++ b/src/config.c
@@ -0,0 +1,6 @@
+#include "config.h"
+
+#include <stdio.h>
+
+/* 壁纸列表，支持通配符和 shell 环境变量拼接，最后以 NULL 结尾 */
+const char *wallpager_list[] = {NULL};
diff --git a/src/include/config.h b/src/include/config.h
new file mode 100644
index 0000000..0375e13
--- /dev/null
+++ b/src/include/config.h
@@ -0,0 +1,3 @@
+#pragma once
+
+extern const char *wallpager_list[];
diff --git a/src/include/types.h b/src/include/types.h
new file mode 100644
index 0000000..83cfacb
--- /dev/null
+++ b/src/include/types.h
@@ -0,0 +1,61 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+
+typedef struct monitor_t monitor_t;
+typedef struct client_t client_t;
+
+typedef struct layout_t {
+  const char *symbol;
+  void (*arrange)(monitor_t *monitor);
+} layout_t;
+
+#define TAG_SYMBOL_LENGTH 32
+
+/* 避免引入 xcb 头文件 */
+typedef uint32_t xcb_window_t;
+
+struct monitor_t {
+  uint32_t index;
+  int32_t monitor_x, monitor_y, window_x, window_y;
+  uint32_t monitor_width, monitor_height, window_width, window_height;
+
+  uint32_t selected_tag;
+  uint32_t tag_count;
+  char (*tags)[TAG_SYMBOL_LENGTH];
+
+  /* 为了避免引入 cairo 相关头文件，这里用 void *
+   * 指针代替实际的指针类型，使用时强转为相应指针类型使用即可 */
+  void *surface; /* cairo_surface_t */
+  void *cr;      /* cairo_t */
+
+  const layout_t *layout;
+  monitor_t *next;
+
+  client_t *clients;
+  client_t *clients_stack;
+  client_t *selected_client;
+
+  xcb_window_t bar_window;
+};
+
+struct client_t {
+  char name[256];
+  int32_t x, y;
+  uint32_t width, height, border_width;
+  uint32_t tags;
+  bool fullscreen;
+  bool floating;
+
+  monitor_t *monitor;
+  client_t *next;
+  client_t *stack_next;
+
+  xcb_window_t window;
+};
+
+typedef struct wallpaper_config_t {
+  uint32_t count;
+  char **path_list;
+} wallpaper_config_t;
diff --git a/src/include/utils.h b/src/include/utils.h
index ed860bf..830329f 100644
--- a/src/include/utils.h
+++ b/src/include/utils.h
@@ -1,8 +1,11 @@
 #pragma once
 
+#include <stdbool.h>
 #include <stddef.h>
 
 #define LENGTH(X) (sizeof(X) / sizeof(X)[0])
 
 void die(const char *format, ...);
 void *ecalloc(size_t number_of_member, size_t member_size);
+
+bool file_exist(const char *path);
diff --git a/src/main.c b/src/main.c
index 2292183..ad7d571 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,26 +1,120 @@
+#include <glib.h>
+#include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
+#include <wordexp.h>
 
+#include "config.h"
+#include "types.h"
 #include "utils.h"
 #include "xcb.h"
 
+static void init_monitors(void);
+static wallpaper_config_t *parse_wallpaper_config(const char **wallpapers);
+static void free_wallpaper_config(wallpaper_config_t *wallpaper_config);
+static void cleanup(void);
+
+static monitor_t *monitors = NULL;
+static wallpaper_config_t *wallpaper_config = NULL;
+
+void init_monitors(void) {
+  monitor_rect_t *mr = detect_monitor_rect();
+  uint32_t i = 0;
+  while (mr) {
+    monitor_t *m = ecalloc(1, sizeof(monitor_t));
+    m->monitor_x = mr->x;
+    m->monitor_y = mr->y;
+    m->monitor_width = mr->width;
+    m->monitor_height = mr->height;
+    m->index = i;
+
+    printf("mon[%u]: x: %d, y: %d, w: %u, h: %u\n", i, mr->x, mr->y, mr->width,
+           mr->height);
+
+    if (!i) monitors = m;
+
+    i++;
+    monitor_rect_t *next_mr = mr->next;
+    free(mr);
+    mr = next_mr;
+  }
+}
+
+wallpaper_config_t *parse_wallpaper_config(const char **wallpapers) {
+  if (!wallpapers) return NULL;
+
+  wallpaper_config_t *wc = ecalloc(1, sizeof(wallpaper_config_t));
+
+  GStrvBuilder *builder = g_strv_builder_new();
+  for (int i = 0; wallpapers && wallpapers[i]; i++) {
+    wordexp_t p;
+    if (wordexp(wallpapers[i], &p, 0)) continue;
+
+    for (size_t i = 0; i < p.we_wordc; i++) {
+      size_t len = strlen(p.we_wordv[i]) + 1;
+      char *realpath = ecalloc(len, sizeof(char));
+      strncpy(realpath, p.we_wordv[i], len);
+      g_strstrip(realpath);
+      if (file_exist(realpath)) g_strv_builder_add(builder, realpath);
+
+      free(realpath);
+    }
+    wordfree(&p);
+  }
+
+  wc->path_list = g_strv_builder_unref_to_strv(builder);
+  wc->count = g_strv_length(wc->path_list);
+  if (wc->count) return wc;
+
+  free_wallpaper_config(wc);
+  return NULL;
+}
+
+void free_wallpaper_config(wallpaper_config_t *wallpaper_config) {
+  if (!wallpaper_config) return;
+
+  g_strfreev(wallpaper_config->path_list);
+  free(wallpaper_config);
+}
+
+void cleanup(void) {
+  clean_xcb();
+
+  free_wallpaper_config(wallpaper_config);
+  wallpaper_config = NULL;
+
+  monitor_t *m = monitors;
+  client_t *c = m->clients;
+  while (m) {
+    while (c) {
+      client_t *tc = c->next;
+      free(c);
+      c = tc;
+    }
+    monitor_t *tm = m->next;
+    free(m);
+    m = tm;
+  }
+  monitors = NULL;
+}
+
 int main(int argc, char *argv[]) {
   if (has_other_wm_running()) {
     die("another window manager is already running");
   }
 
-  {
-    monitor_rect_t *mr = detect_monitor_rect();
-    uint32_t i = 0;
-    while (mr) {
-      printf("mon[%u]: x: %d, y: %d, w: %u, h: %u\n", i, mr->x, mr->y,
-             mr->width, mr->height);
-      mr = mr->next;
-      free(mr);
+  wallpaper_config = parse_wallpaper_config(wallpager_list);
+  if (wallpaper_config) {
+    printf("wallpaper count: %u\n", wallpaper_config->count);
+    for (uint32_t i = 0; i < wallpaper_config->count; i++) {
+      printf("wallpaper[%02u]: %s\n", i, wallpaper_config->path_list[i]);
     }
   }
 
+  init_monitors();
+
   window_list_t *window_list = scan_window_list();
   if (window_list) {
     for (uint32_t i = 0; i < window_list->count; i++) {
@@ -31,7 +125,7 @@ int main(int argc, char *argv[]) {
   }
 
   free_window_list(window_list);
-  clean_xcb();
+  cleanup();
 
   return 0;
 }
diff --git a/src/utils.c b/src/utils.c
index 7755a07..d911534 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -1,9 +1,11 @@
 #include "utils.h"
 
 #include <stdarg.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 
 void die(const char *fmt, ...) {
   va_list ap;
@@ -30,3 +32,8 @@ void *ecalloc(size_t number_of_member, size_t member_size) {
 
   return p;
 }
+
+bool file_exist(const char *path) {
+  if (!path || !*path) return false;
+  return access(path, R_OK) == 0;
+}