The random delay jitter of the time division multiplexing has an influence on the real-time of line comparison pilot protection data in packet transport network, such jitter even makes a threat to the security of power grid. By analyzing the scheduling mechanism and the jitter principle, a random delay jitter mathematical model for end to end service is established. The influence of network parameters, such as package size, background traffic, service path node number and the node throughput are researched by numerical simulation. Simulative results show that, the random delay jitter can be reduced and the network performance can be improved effectively by setting these parameters reasonably. The research results have value for the configuration of the line comparison pilot protection data in packet transport channel.