diff --git a/EPD/EPD_service.c b/EPD/EPD_service.c
index 2d89c5e..63a8992 100644
--- a/EPD/EPD_service.c
+++ b/EPD/EPD_service.c
@@ -94,6 +94,13 @@ static void epd_send_time(ble_epd_t * p_epd)
     ble_epd_string_send(p_epd, (uint8_t *)buf, strlen(buf));
 }
 
+static void epd_send_mtu(ble_epd_t * p_epd)
+{
+    char buf[10] = {0};
+    snprintf(buf, sizeof(buf), "mtu=%d", p_epd->max_data_len);
+    ble_epd_string_send(p_epd, (uint8_t *)buf, strlen(buf));
+}
+
 static void epd_service_on_write(ble_epd_t * p_epd, uint8_t * p_data, uint16_t length)
 {
     NRF_LOG_DEBUG("[EPD]: on_write LEN=%d\n", length);
@@ -128,6 +135,7 @@ static void epd_service_on_write(ble_epd_t * p_epd, uint8_t * p_data, uint16_t l
               epd_config_write(&p_epd->config);
           }
           p_epd->epd = epd_init((epd_model_id_t)id);
+          epd_send_mtu(p_epd);
           epd_send_time(p_epd);
         } break;
 
diff --git a/html/js/main.js b/html/js/main.js
index 035ce1d..b75381d 100644
--- a/html/js/main.js
+++ b/html/js/main.js
@@ -314,7 +314,11 @@ function handleNotify(value, idx) {
     if (textDecoder == null) textDecoder = new TextDecoder();
     const msg = textDecoder.decode(data);
     addLog(msg, '⇓');
-    if (msg.startsWith('t=') && msg.length > 2) {
+    if (msg.startsWith('mtu=') && msg.length > 4) {
+      const mtuSize = parseInt(msg.substring(4));
+      document.getElementById('mtusize').value = mtuSize;
+      addLog(`MTU 已更新为: ${mtuSize}`);
+    } else if (msg.startsWith('t=') && msg.length > 2) {
       const t = parseInt(msg.substring(2)) + new Date().getTimezoneOffset() * 60;
       addLog(`远端时间: ${new Date(t * 1000).toLocaleString()}`);
       addLog(`本地时间: ${new Date().toLocaleString()}`);