In order to realize the packet switched network compatible with the existing circuit switched network, the pseudo wire simulation technology is used to shield the difference between the circuit switching network and the packet switching network, and the seamless connection between the two networks is realized. Based on the pseudo wire simulation and E1 pseudo wire simulation protocol, This paper introduces the implementation method of an adaptive clock in pseudo wire simulation and the solution to the asymmetry of bidirectional delay. The experimental data show that this method can control bidirectional delay in E1 pseudo wire simulation within 2 μs.