When we exploit multiple channels in MAC protocol, we can achieve a higher network throughput than using one single channel due to that multiple transmissions can take place simultaneously. In this paper, we proposed a novel group-based multichannel MAC protocol which cannot only utilize multiple channels to transmit data packets but allow using multiple channels to propagate control packets. The protocol we presented is simple and suitable for wireless ad hoc networks with multiple available channels. The simulation results show that our protocol has the superior performances in network throughput to previous work.