In view of the obviously increasing of fluid accumulation in some old wells in Fuling shale gas field, in order to develop suitable drainage gas production technology, it is planned to carry out pilot tests of plunger gas lift in several gas wells in Block W of the shale gas field. Because shale gas wells have the characteristics of diameter expansion in the production wellhead and diameter reduction in the production tubing string, the application of conventional plunger technology is restricted. For this reason, the wellhead modification of shale gas wells and the design of the combined plunger were carried out, which has effectively solved the wellhead bottleneck and leakage problems in the application of plunger technology in shale gas wells. In addition, this article also introduces two methods for judging the feasibility of the application of plunger drainage technology in the Fuling shale gas field. These methods have strong guidance for the selection of plunger wells in Block W. At the same time, combined with the actual on-site production, the process has shown significant process effects, system optimization effects and better economic benefits in the test. 13 wells were applied on site in Block W, with a success rate of 100% . The successful trail test of the plunger drainage gas recovery technology not only further improved the drainage and gas recovery process system of the Fuling shale gas field, but also provided a guarantee for the increase in production and efficiency of the gas field due to its promotion potential.