Abstract: During signal processing, a large number of correlative ectypes with different scales are prestored in system,especially for high-speed target and high precision estimation of velocity. The storage of ectypes burdens hardware system heavily.In order to solve the problem that the multi-velocity sampling is difficult to calculate the broadband correlative processing ectypes, a calculation method based on the anti-confusion chirp Z transform (CZT) is presentedfor broadband correlative ectype fast Fourier transform (FFT) in this paper. However, the broadband correlative ectype FFT will bring transform confusion when ectypal scale a>1,therefore a fast algorithm based on anti-confusion CZT is proposed. Simulation results indicate that the proposed algorithm can calculate the broadband correlative ectype FFT efficiently and accurately.