This paper presents a reliable design method of infrared communication protocol.The method use automatic repeat and stop-and-wait protocol,when the source station transmits a single frame and then must await an acknowledgment;no other data frames can be sent until destination station′s reply arrives at the source station;when errors occur,one station attempts repeating the frame not more than three times.Through the experiments,we found a more appropriate waiting time,in practice,it produces a good result and the reliability of transmission is improved.