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We propose a new algorithm based on a widely used routing scheme of ad hoc network - dynamic source routing (DSR), which is bandwidth guarantee source routing (BGSR). In this scheme, with admission control, the flooding overload is effectively decreased. And with resource reservation, quality of service (QoS) is guaranteed. Also a new bandwidth calculation algorithm - available bandwidth measurement algorithm (ABMA) - is presented in detail. Then the simulation results further illustrate the achievements of BGSR.