Abstract: According to working environment of hydraulic system of pushing mechanism of coal plough and convey unit, a simulation model of the hydraulic system was built in AMESim hydraulic simulation software. Dynamic characteristics of the hydraulic system were simulated by changing value of main influence factors of the hydraulic system including elastic modulus of emulsion liquid, working load and loop back pressure in practical scope. According to simulation results, influence degree of each factor on dynamic performance of the hydraulic system was analyzed, and corresponding improving measures for system performance were put forward.