Abstract: Technical improvement on sealing system and seal gas supply system of CDP-416 Centrifugal Compressor is carried out in Fugu Compressor Station of Shanxi-Beijing Gas Transmission Pipeline.In the technical improvement, supply technical process and control process of dry gas seal system are renewed and perfected.For the gas seal supply system, installing manual ball valve, increasing auxiliary spare seal gas resource, renewing operating standard, manually controlling supply pressure of auxiliary seal gas, shortening venting time of process gas within compressor after it shuts down are carried out.All these make supply process of seal medium more rational for the operating of compressor sets at different stages, and meet the requirements of seal gas supply for compressor sets and save more nitrogen.