(ArcGISMobile is a mobile GIS development framework launched by ESRI from ArcGIS9.2. Its appearance extends the use of ArcGISServer to the mobile field. This paper introduces the main attributes and functions of ArcGIS Mobile, as well as the software and hardware requirements and main development methods for developing mobile GIS, analyzes and discusses on the key technologies for realizing mobile GIS, and finally looks forward to its development and application prospects.)