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The software of SYSWELD was used to build model and simulate thermal cycle of in-service welding onto active gas pipeline. Influence of pipe diameter, wall thickness and heat input on thermal cycle was studied. The results show that t8/5,t8/3 and peak temperature of inner surface decrease when wall thickness increases from 5 mmto12mm.But t8/1 will increases with the increase of wall thickness and will decrease after the wall thickness is larger than 7mm.Pipe diameter has little influence on thermal cycle and that influence can be ignored when pipe diameter is greater than 273mm T8/5,t8/3,t 8/1 and peak temperature of inner surface will increase with the increase of heat input.