The invention provides a method of realizing the direct communication between terminals of a SCAMA system and the application of the method. The invention comprises the steps that each signal frame emitted by a sender terminal carries SYNC, and a receiver terminal obtains the synchronization with the sender terminal based on SYNC. Based on the synchronization established between the sender terminal and the receiver terminal, the receiver terminal receives and demodulates the signal frame from the sender terminal. The method of the invention makes full advantage of the prior SCDMA system technology and redesigns the prior physical layer frame structure of the SCAMA system, so as to realize the direct communication between terminals of the SCAMA system.