Abstract: In order to study the dual-priority MAC protocol in Wireless Sensor Networks under actual channel conditions,the hardware circuit implementation scheme based on Field Programmable Gate Array (FPGA) is proposed.First,the average cycle method is used to establish a mathematical model according to the P-persistent CSMA,and the throughput and the average power of nodes are obtained.Then the corresponding functional modules are designed based on protocol control principle using Verilog HDL,and a stable transmission circuit system is established.Finally,the simulation value is consistent with the theoretical value,which confirming that the design scheme has the characteristics of high accuracy and good real-time transmission performance.