For improving the accuracy of diluting jamming, based on analyzing the missile seeker target acquisition, establish the seeker launch distance model. According to principle and launch mode of diluting jamming, establish launch time and distance model, and carry out simulation analysis. The results show that the model influence of seeker resolution power, position relation of missile and ship formation, formation maneuver tactics on jamming launch time and distance. It provides theory basis for improving pertinence and efficiency for diluting jamming, and save jamming resources.