Abstract: The analysis of solar radiation is an important basis for the evaluation of photovoltaic power station projects. Aiming at the calculation and visualization of various kinds of data in the analysis process, this paper designed and implemented the provincial solar radiation simulation visualization query platform. The platform is divided into data processing subsystem and query analysis subsystem according to main functions. Using MODIS cloud amounts data and historical data in weather stations and radiation stations, the data processing subsystem calculates multi-element radiation-related data with common standard. The query analysis subsystem combines map image with real data to make data simulating more intuitive and the analysis more reasonable. The data processing subsystem uses Qt as the development tool. Query analysis subsystem uses ArcGIS Desktop, ArcGIS Server and MySQL database software, combining with Dojo, C #, ASP.NET MVC technology to develop it. The platform uses Python as a “glue” to connect two subsystems to automate data processing and publishing. Platform combines data processing and data visualization, which can simulate and analyze the solar radiation at provincial level with an accuracy of 1 km×1 km, and provide timely, effective and scientific technical support for photovoltaic data analysis and photovoltaic power station construction.