Abstract: In Sichuan and Chongqing gas fields, the problem of scaling and clogging in ground equipment and pipeline is widely existing during gas recovery by water drainage, gas water transfer and reinjection process. Especially in recent years, with the secondary development of a large number of high temperature, high water production gas wells, the problem of scaling in gas water ground conveying system is becoming more and more prominent, which has a strong impact on normal production of the gas field. To solve this problem, a new type of scale inhibitor used in high temperature gas field was studied. This paper briefly introduces the development, performance evaluation and field application of the new scale inhibitor CT4-37. Laboratory evaluation and field application test results show that this new scale inhibitor has advantages of high temperature resistance, high salts and calcium tolerance, and also high efficiency while low toxicity, which has a good inhibition effect to calcium carbonate scales and calcium sulfate scales formed from gas field water with high salinity. Under 80 ℃ and 25 mg/L reagent dosage, the inhibition rate can reach 95%.