For the recognition of modulation types of pulse compression radar signals, in this paper, a gradually detailed recognition method was proposed. Firstly, the rough recognition was carried out to differentiate PSK signals and FM signals; Then the detailed classification for PSK signals was realized by the method of instantaneous autocorrelation with time domain addition; Finally, the detailed classification for FM signals was realized with the method of one-off instantaneous autocorrelation. Some experiments prove that the method is easy for computation and valid for performance, which is very valuable in engineering application.