Abstract: According to the signal model of LFM radar, the reason of range, Doppler and wave beam migration, and the variety of target RCS during accumulation period in space debirs detection were analysed. Based on research of compensation on striding three dimension, flight path tracking, and frequency diversity, the signal timewidth and bandwidth influencing on radar detecting ability were analysed and simulated, and a conclusion was obtained that this method was applicable for solving target capture and tarcking precision from far to near distance. At last the simulation demonstrates the validity of the algorithm with providing the compensation on Doppler dimension, LS and Kalman in flight path tracking and variety of range for frequency diversity method.