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With the development and prosperity of ultra wideband (UWB) technologies, the multiple access UWB system has been a hot research topic. Multiuser detection technique has the potential to enlarge the system capacity in multiple access UWB communication environments. In this paper, a new hybrid multiuser receiver is proposed for DS-UWB system. To implement the hybrid receiver, an improved genetic algorithm (GA) proposed by the author is incorporated with the parallel interference cancellation (PIC) detector to further eliminate the multiuser interference, and provide better detection performance. The improved GA has faster convergence performance, and it adopts a simple but effective population initialization method based on the concept of Hamming sphere solution space, which can make full use of the information delivered by the input chromosome. Simulation results show the proposed new hybrid multiuser receiver possesses better detection performance and near-far resistant ability.