In the actual secondary development pattern of GIS,some problems still exist.For resolving them,this paper put forward a framework pattern of plug-in GIS secondary development which would be more prone to developing and applying.This application framework is based on ArcEngine and.NET development platform,using plug-in development techniques,according to the specification of ArcObjects interface,realizing the ArcObjects interface,rewriting main framework class and forming encapsulation.To achieve the purpos...