diff --git a/test/case52/src/testcase52.c b/test/case52/src/testcase52.c
index e4ebde2..29fd8ff 100755
--- a/test/case52/src/testcase52.c
+++ b/test/case52/src/testcase52.c
@@ -92,6 +92,8 @@ void *handleUdpTransmission(void *arg)
     server_addr_case52.sin_family = AF_INET;                                // IPv4
     server_addr_case52.sin_port = htons(SERVER_PORT_CASE52);                // 端口转换
     server_addr_case52.sin_addr.s_addr = inet_addr(SERVER_IP_CASE52);       // IP转换
+    int flags = fcntl(sockfd_case52, F_GETFL, 0);
+    fcntl(sockfd_case52, F_SETFL, flags | O_NONBLOCK);
     printf("[socket]:UDP ready\n");
     // mmap
     /************************************************************************************** */
@@ -175,7 +177,7 @@ void *handleUdpTransmission(void *arg)
             // 偏移
             size_t tx_data_offset = wr_cunt * 16016 + arr_cunt * 2;
             // cpy
-            memcpy((char*)map_base_tx_case52 + tx_data_offset, &txt_buffer[data_index], 2);
+            memcpy((char*)map_base_tx_case52 + tx_data_offset, &txt_buffer[data_index], 2);//65536
             // 更新数据索引
             data_index = (data_index + 1) % 65535;
         }
@@ -189,26 +191,16 @@ void *handleUdpTransmission(void *arg)
         printf("[slot]:%u \n", slot_ind_flag);
         if (1 == slot_ind_flag)
         {
-            printf("[test 01]\n");
+            
             slot_ind_flag = 0; 
             /************************************************************************************** */
-            // wr 16016*64(byte) [8008] 2字节复制，一次while循环会写入 1/20 的数据，触发条件为slot_ind_flag
-            printf("[test 02]\n");
-            size_t buffer_start = data_index;// 当前数据读取的起始索引
-            size_t elements_remaining = 65535 - buffer_start;// 从buffer_start到数组末尾的剩余元素数
-            size_t elements_to_copy = (elements_remaining >= 8008) ? 8008 : elements_remaining; // 剩余
-            printf("[test 03]\n");
-            // 拷贝前半部分（可能跨数组末尾）
-            printf("[test 04]\n");
-            memcpy((char*)map_base_tx_case52 + wr_cunt * 16016, &txt_buffer[buffer_start], elements_to_copy * 2);
-            printf("[test 05]\n");
-            // 处理数组环绕
-            if (elements_to_copy < 8008) {
-                size_t elements_needed = 8008 - elements_to_copy;
-                memcpy((char*)map_base_tx_case52 + wr_cunt * 16016 + elements_to_copy * 2, &txt_buffer[0], elements_needed * 2);
+            // wr 16016*20(byte),一次while循环会写入 1/20 的数据，触发条件为slot_ind_flag
+            const size_t current_pos = wr_cunt * 16016;
+            
+            for (int i = 0; i < 8008; ++i) {
+                const uint16_t value = txt_buffer[(data_index + i) % 65535];
+                memcpy((char*)map_base_tx_case52 + current_pos + i*2, &value, 2);
             }
-            printf("[test 06]\n");
-            // 更新数组索引和块索引
             data_index = (data_index + 8008) % 65535;
             wr_cunt = (wr_cunt + 1) % 20;
             /************************************************************************************** */
@@ -222,7 +214,6 @@ void *handleUdpTransmission(void *arg)
             /************************************************************************************** */
             // 尝试读取
             uint8_t block_n = 0;
-            printf("[test 08]\n");
             if (w_idx == r_idx){
                 printf("[while(1)]: w_idx = %hhu, r_idx = %hhu\n", w_idx, r_idx);
                 printf("[while(1)]: 空\n"); 
@@ -245,6 +236,15 @@ void *handleUdpTransmission(void *arg)
                             (const struct sockaddr*)&server_addr_case52,
                             sizeof(server_addr_case52)
                         );
+                        if (send_len == -1) {
+                            if (errno == EAGAIN || errno == EWOULDBLOCK) {
+                                printf("[UDP] UDP发送缓冲区满\n");
+                                continue;
+                            }else{
+                                perror("sendto error");
+                                continue;
+                            }
+                        }                                    
                         r_idx ++ ;
                     }
                     // 更新r_idx,如果到头 
@@ -267,6 +267,15 @@ void *handleUdpTransmission(void *arg)
                             (const struct sockaddr*)&server_addr_case52,
                             sizeof(server_addr_case52)
                         );
+                        if (send_len == -1) {
+                            if (errno == EAGAIN || errno == EWOULDBLOCK) {
+                                printf("[UDP] UDP发送缓冲区满\n");
+                                continue;
+                            }else{
+                                perror("sendto error");
+                                continue;
+                            }
+                        }                          
                         r_idx ++ ;
                     }
                     r_idx = r_idx % 8;
@@ -285,6 +294,15 @@ void *handleUdpTransmission(void *arg)
                             (const struct sockaddr*)&server_addr_case52,
                             sizeof(server_addr_case52)
                         );
+                        if (send_len == -1) {
+                            if (errno == EAGAIN || errno == EWOULDBLOCK) {
+                                printf("[UDP] UDP发送缓冲区满\n");
+                                continue;
+                            }else{
+                                perror("sendto error");
+                                continue;
+                            }
+                        }                          
                         r_idx ++;
                     }
                 }