The technical casing depth of shale gas wells in Southern Sichuan Block is 2600~2900 m. Through the previous 11 times of technical casing cementing construction， it is found that the main problems of technical casing cementing in this block are the development of multiple gas layers with active shallow gas， and the Maokou Formation is easy to leak. In the process of cementing， the contradiction between pressure stabilization and anti-leakage is prominent. This paper systematically analyzes the main problems encountered in the process of technical casing cementing of shale gas in Southern Sichuan Block. Through the research on the pressure bearing capacity after plugging in easy-to-leak formations and the design of cement slurry， slurry column structure， displacement， and the auxiliary technology for pressure stabilization， a set of process technology suitable for the cementing of shale gas technical casing cementing in Southern Sichuan Block is formed， and the effect of field application is remarkable.