Abstract: In the light of characteristics of Sichuan-to-East Gas Pipeline with large diameter, high pressure and long distance, the type selection of metering device, solution of pressure regulating process and control/adjustment of gas flowrate are discussed in this paper. Based on the analysis and comparison of several combination solutions for pressure regulating process, a 3-level control model for flowrate adjustment is determined.The 3-level control solution is as follows: (1) the control of downstream pressure is governed with work pressure regulating valves if SSV and monitoring pressure regulating valve are in wide-open position; (2) to maintain downstream pressure, monitoring pressure regulating valve will begin to work if work pressure regulating valve is in the case of malfunctioning and (3) the SSV will cut off the gas source if monitoring pressure regulating valve is under malfunctioning, and meanwhile, the controller will start up the backup loop in order to ensure the safety of downstream pipe and equipment. The above solution, being available for the gas supply to important users under high pressure and heavy flowrate, is safe and effective with a sound adjustability.