Abstract: Considering that traditional adaptive multi-user detectors haven t made full use of the character of multi-access signals, a new algorithm of joint adaptive multi-user detection is put forward. In this algorithm, the received signal is used as the reference signal, and the input of adaptive filter changes into the sampled value of each user s spread spectrum serial. Analysis and Simulation results show that this kind of detector has faster convergence rate and better anti near-far impact ability, so it has good potential for practical applications.