In order to improve spectrum utilization ratio, it is very necessary to enhance the practicability and veracity of the cooperation spectrum sensing. This paper analyzes and discusses the key technology of cooperation spectrum sensing and data transmission reliability by using the way of multipath data to increase the reliability and practicability during the data transmission process. By this means the data in every perceptive node can be transmitted to the central node more exactly, reliably and practically to make a quick and accurate judgment. And using this method the influences caused by interference and noises during the data transmission process can be overcome. Simulation results show that the method is feasible and lays a foundation for practical application of cooperation spectrum detection technology.