Aiming at the small data capacity and the short transmission distance of the traditional infrared (IR) system,a new transmission method based on fiber is proposed.Using the fiber transmission technique,a kind of IR image transmission system is designed based on the data output format of the IR sensor.Meanwhile,the design principles and methods of the key modules are discussed.The application results show that the method is stable and reliable.Compared with the traditional electric transmission,the proposed method can solve the problem of the small data capability and short transmission distance.And the system performance such as the stability,error rate,cable quantity etc,can be improved effectively.