Abstract: The dalian meteorological intranet business platform based on ArcGIS is based on dalian real-time meteorological database built in early 2015. Using ArcGIS+EXTJS+J2EE system architecture，it has built a business platform which includes detecting data，forecasting products，service products，county bureau products，industry data，numerical forecasting and data download of seven functional modules. The platform has many functions such as text，pictures，tables，graphs，bar charts，color spots，GIS data overlay，etc. And it has the functions of factor selection，data interactivity query，factor statistics ranking and so on. It can further meet the needs of users， fully realize the sharing application of meteorological data，and provide effective data support services for meteorological forecasting and meteorological service in the city and county.