The LPI/LPD communication is a technology of hiding the information into the noise or other useless signals through an efficient modulation, making it difficult for the detector to capture the hidden information. Spread- spectrum communication has good characteristics of LPI/LPD and has been widely used. Firstly, this paper introduces the technology of spread spectrum communication and then summarizes the existing methods of detection in detail. The quality factor is introduced to give an effective evaluation for the performance of interception. There are so many methods to design the waveform, which has good characteristics of LPI/LPD. This article focuses on the analyzing of the chaotic transform and wavelet transform. Finally the develop trends of the LPI/LPD communication were discussed.