With respect to the exponential computation complexity of the optimal multiuser detection in CDMA systems, a new sub optimal multiuser detector which employs a genetic algorithm and a local minimization algorithm was proposed from a combinatorial optimization viewpoint. 针对码分多址接入(CDMA)系统中最优多用户检测器的指数计算复杂度问题,从组合优化的角度,提出了一种基于遗传算法和局部最小算法的次优多用户检测器。