A shared platform for the dynamic effect evaluation of precipitation enhancement， based on the model of Browser/Server (B/S)， is developed by using API, the second development platform of Google Earth. The system is based on “.NET” platform with C# as the main program language. The location of local rocket launchers and the flying track of aircraft are merged on the Google Map. Areas of the operated regions are affected by rocket seedings and/or aircraft seedings and the contrast regions can be promptly sketched and calculated dynamically. Databases of precipitation enhancement， meteorological observation and automatic raingauge can be browsed via Internet, and the reports of effect evaluation of precipitation enhancement can be exported by the system. The unification of regional effect evaluation of precipitation enhancement is realized. The system contains plenty of digital geography information from Google Earth. It is interactive and easily operated with friendly interface. A shared system for the regional effect evaluation of precipitation enhancement is realized.