diff --git a/example/periphery/usart/python/README.md b/example/periphery/usart/python/README.md
index dd87600a777992a944d2aad6c4ca0c1751573b64..84f5b50f5705469fafd0a4752b8a8ed28942d90e 100644
--- a/example/periphery/usart/python/README.md
+++ b/example/periphery/usart/python/README.md
@@ -112,16 +112,28 @@ class USARTBase:
 from lockzhiner_vision_module.periphery import USART1
 
 
+def read_exactly(usart, total_bytes):
+    """累积读取 exactly total_bytes 个字节"""
+    buffer = bytearray()
+    while len(buffer) < total_bytes:
+        chunk = usart.read(total_bytes - len(buffer))
+        if not chunk:
+            continue
+        buffer.extend(chunk.encode('latin1'))
+    return bytes(buffer)
+
+
 if __name__ == "__main__":
     usart = USART1()
-    if usart.open(115200) is False:
+    if not usart.open(115200):
         print("Failed to open usart.")
         exit(1)
 
-    print("Start receiving serial port data.")
+    print("Start receiving serial port data (waiting for 1024 bytes per output)...")
 
     while True:
-        print(usart.read(1024))
+        data = read_exactly(usart, 12)
+        print(f"Received {len(data)} bytes: {data}...")
 ```
 
 串口发送例程的核心代码如下:
diff --git a/example/periphery/usart/python/test_usart_read.py b/example/periphery/usart/python/test_usart_read.py
index d80c972d6b89a426436dd1fc9ff8d25a36f614fa..b2966efa61dc1d27aa2935667e12e778bb846bc6 100644
--- a/example/periphery/usart/python/test_usart_read.py
+++ b/example/periphery/usart/python/test_usart_read.py
@@ -1,13 +1,25 @@
 from lockzhiner_vision_module.periphery import USART1
 
 
+def read_exactly(usart, total_bytes):
+    """累积读取 exactly total_bytes 个字节"""
+    buffer = bytearray()
+    while len(buffer) < total_bytes:
+        chunk = usart.read(total_bytes - len(buffer))
+        if not chunk:
+            continue
+        buffer.extend(chunk.encode('latin1'))
+    return bytes(buffer)
+
+
 if __name__ == "__main__":
     usart = USART1()
-    if usart.open(115200) is False:
+    if not usart.open(115200):
         print("Failed to open usart.")
         exit(1)
 
-    print("Start receiving serial port data.")
+    print("Start receiving serial port data (waiting for 1024 bytes per output)...")
 
     while True:
-        print(usart.read(1024))
+        data = read_exactly(usart, 12)
+        print(f"Received {len(data)} bytes: {data}...")