Ionospheric delay is a major error source in satellite navigation and positioning. The study of ionospheric changes, especially regional changes, is of great theoretical significance and practical value. Meanwhile, ionospheric climatology is an important part of ionospheric research. However, recently, it is changes in global region, hemispheric region and different latitude belts that are the most studied in ionospheric climatology, while it is basically blank in regional ionospheric climate research. As a result, the Regional Mean Electron Content (RMEC) is proposed for regional ionospheric climate research.