With the development of belt conveyor dynamical analysis was required to design conveyor. The viscoelasticity model suiting to the belt was selected, and simulation model of driving device with closedloop controlling was developed, which indicated that motor speed and its output torque vary with load and time, therefore the simulation results were more close to practice. The dynamic simulation model of overall conveyor system was programmed, and PID controller was applied to stabilize starting process of conveyor, thus the closedloop controlling system was created in simulation software. The simulation of dynamic performances of conveyor provided accurate design techniques to controlling starting process and optimizing on belts system.