In order to analyze the fiber changes of the optical- fiber guidance missile in flight and meet the needs of the missile static and dynamic simulation，a device that can simulate data link transmission loss characteristics of optical fiber was designed. The dynamic and static models of system transmission loss were established. Using the optical simulator,the channel interference,dynamic loss,data delay,etc, that may occur in the missile flight were implemented.The experiment results show that the interference range of optical signal is -50 dBm~-40 dBm, the delay range of optical signal transmission is 16.65 s~99.9 s,the adjustment range of simulator dynamic loss is 0 dBm~50 dBm.The performance verification of optical fiber transmission system can be realized.