A multi-channel MAC (CR-LMAC)protocol for dynamic bandwidth allocation in cognitive radio wireless Ad hoc net-work is proposed to solve the problem of the classic local cooperative multi-channel MAC protocol (LCM-MAC)that lacks spec-trum sensing and dynamic bandwidth allocation.The LCM-MAC protocol is improved by introducing the spectrum sensing capa-bilities and a new bandwidth allocation strategy model into its framework and has the adaptive ability of sensing idle channel and dynamically allocating bandwidth.Simulation results show that the improved protocol has a great improvement in overall network throughput and the end to end delay,and has a better performance than the original LCM-MAC protocol.%针对目前经典的本地协作多信道 MAC 协议（LCM-MAC）缺乏频谱感知和带宽动态分配问题，提出一种认知无线电自组织网络（cognitive radio Ad hoc networks，CRAHNs）带宽动态分配多信道 MAC（CR-LMAC）协议。通过引入频谱感知机制和新的带宽分配策略模型，改进 LCM-MAC 协议，使其具备空闲信道感知和动态分配带宽的自适应能力。仿真结果表明，改进后的协议性能优于 LCM-MAC，在网络总吞吐量和端到端时延等方面有较大提高和改善。
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