Water breakthrough is common in middle-shallow gas wells in Western Sichuan Gas Field, which has great influence on stable production of gas wells.In order to improve the liquid carrying capacity of gas wells, the velocity-string technique was introduced in 2012.Most of the wells enjoy stable liquid carrying capacity, which put the decline rate of gas wells under effective control. Yet,some of them have poor economic benefit after implementation.In this paper, based on the statistics of the cost of velocity-string operation, the cost of velocity-string process is calculated,and the process economic evaluation and analysis under different conditions are carried out.The results show that the velocity-string technology has certain economic benefits in the middle-shallow gas wells,but the overall benefits are limited due to relatively lower production before.In order to ensure better economic benefits, it is necessary to select gas wells with daily average gas production rate of more than 10000 cubic meters for operation as far as possible.At the same time, the sensitivity analysis of the fluctuation of natural gas price and other influencing factors is carried out, which provides a basis for economic decision-making for the investment of velocity-string technique in the middle-shallow gas wells in Western Sichuan Gas Field.