Search model of terminal guidance radar of anti-ship missile is very important for probability calculation of target acquisi-tion of anti-ship missile. On the basis of analyzing the search characters of terminal guidance radar of anti-ship missile, the search process of the terminal guidance radar was reduced to the movement of scan beam. The movement included the translational move-ment following the missile body's movement and the rotational movement of scan beam, the mathematic model of the terminal guidance radar dynamic search was built up. The search process of the terminal guidance radar of Harpoon missile was analyzed, the mathematic model in this paper was simulated and validated.