There are shortages in correlation between existing method of rainfall network demonstration and influencing factors of the precipitation distribution. We took the digital basin into the methods of rainfall network demonstration, and described the digital basin construction and information extraction technology. The integration of digital basin and rainfall demonstration technology were made in this paper, the technology of rainfall demonstration includes station network density, correlation analysis, rainfall contours and historical flood forecast analysis. The integrated method of digital basin and rainfall network takes into account the influencing of terrain. The basic idea can offer a reference function for other similar rainfall network demonstration analysis.