Abstract: An ad hoc network is a collection of wireless mobile hosts, which can form a temporary network without the aid of any infrastructure or centralized administration. After the MAC protocol of ad hoc network is studied and the protocol of WTRP is improved and modified, a new uncontested Distributed Parallel Wireless Token Ring Protocol (DPWTRP), which can ensure MAC(Media Access Control) layer QoS for ad hoc network, is presented. The simulation results show that the average delay and queue length in DPWTRP system are much lower than in WTRP system, and the stability is more enhanced. As a result, it could be more fit for the services which require the lower delay.