Based on the traditional disspreading and demodulating scheme for M -ary communication , the idea that the spread spectrum code of many data flows can be disspreaded at the same tlme is firstly presented by using virtual matched filter technology. Furthermore , the new disspreading and demodulating scheme based on this idea is also introduced and analyzed. Researching result shows that this new scheme is very valid for disspreading and demodulating of M-ary communication.