An approach was proposed that real-time speech communication based on Linux system during the period of embedded speech communication system designing. It has adopted the technology of OSS to complete the voice collection and replay, and realize the real-time transmission based on RTP/RTCP by the medium of LIVE storeroom, at the same time, it has made use of multithread technology to accomplish the speech communication on the full duplex. The experiments verify that the approach proposed above is really feasible and efficient. This approach will serve as references to the designs of the correlation products.