Electromagnetic interference produced by direct-drive elevator drive system is one of the main interference sources affecting the normal operation of system. It has great power, wide frequency band and is hard to predict. For direct drive elevator system electromagnetic interference problem, the article adopts multiple software joint simulation method to predict the electromagnetic radiation interference of elevator drive system power cables. Through constructing the elevator vector drive control system, we extract the current of DC power supply as the interference sources, establish the power cable model of direct driving elevator in the electromagnetic simulation software FEKO and conduct simulation analysis of the electric field distribution under the effect of interference sources inside and outside the elevator. The simulation results show that the method of multi-software joint simulation has engineering reference value for electromagnetic compatibility simulation modeling of drive elevator.