With the purpose of detecting micro-Doppler under the background of missile confrontation, the influence of the radar location was researched. It was proved in theory that when the dimension and the dynamic parameters of the precession target are invariable, the micro-Doppler is only determined by the angle which is between the radar sight and the precession axis called the average sight angle. In the research, the change of the average sight angle and the micro-Doppler bandwidth caused by different locations of radar was studied. At the same time the simulation results in the typical scenarios were shown in figures, which validated the ideas. The conclusion of this paper will benefit how to deploy the radar for detecting ballistic targets.