According to the period code of the laser guidance signal,this paper introduced the principle and different classes of the pulse and gave a method of code de-interleaving and identifying based on the statistic way.This method implemented de-interleaving and identifying of multi-threat sources,which based on the independence of pulses and the relativity of period.The signals can be exactly de-interleaved and copy the next code of the laser guidance signal with the validation of the Matlab simulating.