The ship-borne radar system is composed of various radars which are densely distributed. The acquisition ability of ARM to various types of ship-borne radar target determines guidance and hit accuracy error of ARM. Based on working modes of ARM, the distribution characteristic of radiation signals and signal sorting principles of ARM, attacking models of ARM to ship-borne radar system were built, which can be used to calculate acquisition probability of ARM to various types of ship-borne radar. The simulation results show that if ARM adopts random working mode, it's easier to acquire searching radar with larger transmit power and smaller search cycle, but hard to acquire the guidance radar.