Neural network technology is used to recognize PCM code of homing guidance weapon,and this can validate the method of decoding.Firstly,through building linear neural network and train network using two mode,that are size priority and quantity priority of train vector,the generation time of next laser pulse was forecasting.The result of simulation showed the PCM code can be recognized correctly if 2.3 periodic times was offered,and laser pulse whipping on the time axis couldn′t affect the precision of forecasting.This indicated that neural network technology can decode laser pulse code,and this method is suitable for engineering.