Abstract: Ultra wideband technology has the advantages of high transmission rate,low emissive power and simple system structure,which is suitable for wireless communication in coal mine.In Simulink,a communication model of Time-hopping ultra wideband based on multiple access technology is established.Combined with the simulation results,the paper studies each part of the model.It focuses on the problems of multi-user data sending and synchronization acquisition of correlation reception.The results verify the feasibility of the system in the coal mine.