To solve the problem that the conventional phased array radar waveform takes relative large amount of resources of time we studied the working mode of phased array radar and the traditional timeshare transmitted pulses with different repetition periods.Based on which a search method was proposed based on a novel three-band search waveform the parameter selecting principles and signal forms in time domain and frequency domain were given.The analysis to an example shows that this kind of signal can effectively save the time and improve the search performance.Finally some of the outstanding issues are discussed.