In order to settle the problem of high power short pulse laser of Fourier telescope including part period of signal, the technique of multiple pulse segment was first put forward and its basic principle and application was also first studied. Firstly, the conflict between high power short pulse laser and band width of acousto-optic frequency shifter was introduced, and then the difficulty that part period signal was demodulated by conventional time demodulation formula of Fourier telescope was put forward. Secondly, the basic principle of multiple pulse segment was given and the condition of segment between shifting frequency, pulse repetition and pulse width under ideal instance was deduced. Thirdly, the effects of stabilization of frequency shifting and pulse repetition on imaging results of multiple pulse segment were analyzed and the effects of changing pulse width on imaging results of multiple pulse segment under usual condition were studied by computer simulation. At last, the conclusion was acquired that shifting frequency and pulse repetition had no effects on imaging and the figure of object could also been identified under the condition of laser pulse changing less than 25%.