For analysis of some factors on the proportional ship-to-air missile missile distance against an anti-ship missile under multi path effect, it constructed the ship-to-air missile movement model and guidance loop, and anti-ship missile movement model. Through simulation method and a lot of simulation, the simulation results proved that the main reasons affecting miss distance were initial speed and position of ship-to-air missile, control system time constant and order, noise filter time constant, cruising speed of anti-ship missile, division of target image RCS upon target RCS. The achievements of this paper are believed to benefit the analysis of fighting efficiency and tactics use.