Abstract: In order to precisely calculate the clutter power of the radar seeker, this paper presents a new method of judging the ground clutter integration region of radar seeker. According to the geometric relationship between the iso-range lines and iso-Doppler, the shapes of integration regions, which are decided by distance and velocity gate under various sphere coordinates, can be partitioned. This method can precisely locate the ground clutter integration region under specified range gate and velocity gate of the radar seeker. The detailed instruction and analysis are given for each of these regions. Finally, the simulation proves the feasibility of the presented method.