Abstract: Based on the equations recommended in GB 50251, technology calculation model of gas transmission pipeline is set up, the incidence relation between variables in the model is analyzed and technology calculation workflow is given.Different ground temperatures, pipe-soil temperature differential and throttling factors are chosen to calculate.Results show that the higher the ground temperature is·the bigger the pipe-soil temperature differential is; the bigger the pipe-soil temperature differential is, the smaller the throttling factor is and the shorter the station spacing calculated, whose influence is more obvious at bigger pipe diameter, higher pressure and lower throughput.Under the conditions used in this work.the influence of ground temperature on the station spacing goes beyond that of pipe-soil temperature differential, and the influence, at temperature differential being increased to 5 K, surpasses that of throttling effect when it is ignored.