When ballistic target is moving with micro-motion, the Doppler frequency of its scattering points will be modulated by micro-motion which will have negative effect on imaging. In this article, a new method called time selection imaging based on abor transformation formula is put forward, which will focus image effectively. The proposed method seerches the Ddoppler fraguency in time quantum of syraight line approximation in time-frequency domain for the target And the effectiveness of this method is verifies by simulation.