Solid acid is a special system in oilfield stimulation measures.It is used in different processes because of its special acid release mode.Because solid acids require special preparation methods and are highly targeted,solid acids have not been as widely promoted as general acidification measures.In this paper,the successful cases of solid acid in recent years are summarized,and the future development direction of solid acid is deeply considered in order to expect that solid acid measures can play more roles in oilfield production.