Abstract: A new random multi-access protocol for wireless sensor networks (WSNs) was presented.This protocol used the function p(x)-detection control strategy in the packet transmit 1+a and added acknowledge character(ACK) to the system,it can improve the transmission efficiency of WSNs.Compared the theoretical analysis method of average period with the selection of different p(x) function value simulation experiments,they were consistent.The results showed that the protocol enabled the WSNs’ channel resources effectively and improved the system’s transmission quality.