The operation of dehydration is very important in the process of gas transportation.This study aims to evaluate the application feasibility of CO2 dehydration using triethylene glycol,which is also called TEG for short.Aspen Plus software was used to simulate the dehydration process system of CO2 gas trans-portation using TEG dehydration.Parameter analysis and process improvement were carried out for the simulation of dehydration process.At first,a sensitivity analysis was conducted to analyze and optimize operating conditions of conventional CO2-TEG dehydration process system.Subsequently,a recycle unit was introduced into the conventional CO2-TEG dehydration process system,it can be found that the improved process system with the recycle unit has a higher CO2 recovery rate which was about 9.8％ than the conventional one.Moreover,the improved process system showed excellent operation stability through the comparison of simulation results of several processes with various water contents in their feed gases.Although the energy consumption is increased by about 2％,the improved process was eco-nomically and technically feasible for the long-term availability of CO2 pipeline transportation.The sim-ulated results showed that the improved CO2-TEG process system has promising application prospects in CO2 dehydration of CO2 gas transportation with high stability.