Abstract: For the problem of range migration and Doppler migration in the detection of high speed and high maneuvering weak targets, a method for target detection by Doppler frequency compensation and scale transform is presented. Doppler frequency compensation function designed by Doppler frequency estimation is used to eliminate range migration which results from velocity, and the influence of Doppler frequency rate is eliminated by scale transform method, which make the accumulation time unlimited for target motion．It is not need of estimating Doppler frequency rate, and resoves the problem of error estimating in traditional weak targets detection. At the time of estimating Doppler frequency, A method for unambiguous Doppler frequency estimation is presented. The proposed method reduces the calculation amount for avoiding the estimation of fuzzy factor. Additionally, it reduces the demand of input SNR, and it is also avails targets. Simulation results show that it can improve the detection performance of high speed and high maneuvering weak targets greatly.