When the Packet Transport Network（PTN）carries the power communication real-time service in the way of Time Division Multiplexing（TDM）

the parameter selection of de-jitter buffer becomes the key method to improve the service performance.In this paper

we first analyze the influence mechanism of de-jitter buffer parameters on TDM service performance.Then we design the numerical simulation algorithm to find the impact of buffer parameters on service performance.Finally

the optimization of de-jitter buffer parameters is realized by simulation.The results show that the optimized buffer length and packet size can effectively reduce the bit error rate and the transmission delay.