Abstract: The temperature differences between the installation temperature and operation temperature of pigging station was higher than that of the design in Central Asian Natural Gas, and the Owner proposed that the alarm and shutdown of compressor stations should be both considered when the stress calculation is made. The stress calculation of pigging station was carried out under the new boundary condition by CAESAR Ⅱ Software. The results showed that the stress between the bypass pipe of pig launcher/pig receiver and the junction of trunkline didn't meet the needs of standard. The program to technically reform for the pigging station was carried out by means of digging a ditch along the bypass pipe to conduct the stress calculation. It is considered that this program can be taken as a technical reference for the construction of pigging station in long-distance gas pipeline.