Abstract: This paper focuses on the issue of available bandwidth estimation in wireless multihop path and takes the overall QoS provision as the principle in estimation. Through analyzing and quantitative calculating the interference on the multihop path, the analytical model for performance analysis is derived based on queueing networks theory and from which the QoS parameters of each flow along the path are obtained. Based on the model a method for available bandwidth estimation for QoS provision is proposed, which takes the flow,s QoS demands as the constraints and thus overcomes the drawbacks of the existing schemes that only take the maximum achievable throughput as the available bandwidth while the flows other QoS demands may be affected. Both the proposed model and the estimation method are validated through extensive simulations.