Abstract: When one compressor suffers failure shutdown after the commissioning of the initial station the stugy on the fluctuation of pressure and flow rate of upstream gaterhing and transportation pipeline network system is beneficial to guarantee the safe operation of the gathering pipeline network.Firstly, the upstream and downstream gathering pipeline networks of Sichuan to East Gas Pipeline system were analyzed.And then, the effect of failure shutdown of one compressor in the initial station on the upstream system was simulated by the software SPS.It is indicated that when one compressor in the intial station suffers urgent failure shutdown, the pressure and flow rate of purification plant and gathering pipeline network will be impacted and the flow rate (pressure) of another compressor will be increased (decreased). And consequelty, the normal operation of the whole Sichuan to East Gas Pipeline network will be impacted.In the meantime, the pressure of purification system in the purifrication plant may fluctuate, leading to the shutdown of the whole gas field.To solve this problem, it is proposed to add vent devices in the initial station.By virtue of safety interlock release, the pressure of the pipeline network is kept balanced and the effect on another compressor is reduced, so that the normal operation of both upstream and downstream pipeline networks of Sichuan to East Gas Pipeline is guaranteed.