diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2a442b3..0d559f4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,7 +3,7 @@ project(simple-kanban)
 include(TestBigEndian)
 test_big_endian(isBigEndian)
 if (${isBigEndian})
-    set ( WORDS_BIGENDIAN 1 )
+    add_definitions(-DWORDS_BIGENDIAN)
 endif()
 
 #add_definitions(-DLISTEN_ON_IPV6)
diff --git a/README.md b/README.md
index 607eff6..b4ea6c5 100644
--- a/README.md
+++ b/README.md
@@ -72,10 +72,10 @@ make
 ## 0. 启动程序
 
 ```bash
-./simple-kanban-client 127.0.0.1 7777 [-r]
+./simple-kanban-client 127.0.0.1 7777
 ```
 
-接下来即可按照上面的交互流程开始使用。其中末尾的`-r`为可选项（程序只判断参数个数所以请务必放到末尾），表示以与本机相反的顺序发送文件长度。
+接下来即可按照上面的交互流程开始使用。
 
 ## 1. 发送命令
 
diff --git a/client.c b/client.c
index 4198540..f4bf24c 100644
--- a/client.c
+++ b/client.c
@@ -43,7 +43,7 @@ off_t size_of_file(const char* fname) {
     else return -1;
 }
 
-int main(int argc,char *argv[]) {   //usage: ./client host port [-r]
+int main(int argc,char *argv[]) {   //usage: ./client host port
     ssize_t numbytes;
     puts("break!");
     while((sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1);
@@ -75,7 +75,6 @@ int main(int argc,char *argv[]) {   //usage: ./client host port [-r]
                     off_t len = 0;
                     file_size = (uint32_t)size_of_file(buf);
                     #if __APPLE__
-                        if(argc == 4) file_size = htonl(file_size);
                         struct iovec headers;
                         headers.iov_base = &file_size;
                         headers.iov_len = sizeof(uint32_t);
@@ -86,10 +85,7 @@ int main(int argc,char *argv[]) {   //usage: ./client host port [-r]
                         if(!sendfile(fileno(fp), sockfd, 0, &len, &hdtr, 0)) puts("Send file success.");
                         else puts("Send file error.");
                     #else
-                        if(argc == 4) {
-                            uint32_t fs = htonl(file_size);
-                            send(sockfd, &fs, sizeof(uint32_t), 0);
-                        } else send(sockfd, &file_size, sizeof(uint32_t), 0);
+                        send(sockfd, &file_size, sizeof(uint32_t), 0);
                         if(!sendfile(sockfd, fileno(fp), &len, file_size)) puts("Send file success.");
                         else puts("Send file error.");
                     #endif
diff --git a/server.c b/server.c
index e73309a..31ba4ec 100644
--- a/server.c
+++ b/server.c
@@ -145,9 +145,15 @@ int send_all(char* file_path, THREADTIMER *timer) {
             re = !sendfile(fileno(fp), timer->accept_fd, 0, &len, &hdtr, 0);
             if(!re) perror("Sendfile");
         #else
-            #if WORDS_BIGENDIAN
-                uint32_t little_fs = htonl(file_size);
-                send(timer->accept_fd, &little_fs sizeof(uint32_t), 0);
+            #ifdef WORDS_BIGENDIAN
+                uint32_t little_fs;
+                char* q = (char*)(&little_fs);
+                char* p = (char*)(&file_size);
+                q[0] = p[3];
+                q[1] = p[2];
+                q[2] = p[1];
+                q[3] = p[0];
+                send(timer->accept_fd, &little_fs, sizeof(uint32_t), 0);
             #else
                 send(timer->accept_fd, &file_size, sizeof(uint32_t), 0);
             #endif
@@ -219,7 +225,16 @@ int s2_set(THREADTIMER *timer) {
 
 int s3_set_data(THREADTIMER *timer) {
     timer->status = 0;
-    uint32_t file_size = *(uint32_t*)(timer->data);
+    #ifdef WORDS_BIGENDIAN
+        uint32_t file_size;
+        char* p = (char*)(&file_size);
+        p[0] = timer->data[3];
+        p[1] = timer->data[2];
+        p[2] = timer->data[1];
+        p[3] = timer->data[0];
+    #else
+        uint32_t file_size = *(uint32_t*)(timer->data);
+    #endif
     printf("Set data size: %u\n", file_size);
     int is_first_data = 0;
     if(timer->numbytes == sizeof(uint32_t)) {