With the fast development of GIS applications

more and more practical GIS systems have been built

and it is imperative to integrate those systems into a more powerful and convenient system. This article puts forward the concept and framework of GIS integration platform which includes including GIS data integration platform and GIS model integration platform. We first put forward an client/server system architecture as an overall system architecture of GIS integrity platform. By defining Client request

GIS Data Integration Server

GIS Model Integration Server

Application Model Server

and GIS

RS

RDBMS Server

their function and interaction are discussed. In this Architecture

GIS Data Integration Server and GIS Model Integration Server are two key issues to be addressed. As for the GIS data integration platform

a metadata based method for practical concern is suggested. We divide GIS data into four categories: RS image data （Raster）

RS classification data （Vector）

digital map data （vector） and relational data （Attribute）. Each GIS data set registers its metadata information in the platform. Through meta database management system we can link those data into an integrated one by RS image serial number and attribute foreign key. The platform provides GIS information retrieve

GIS model data request and mapping function in integrated

visual and interactive way. As for the model integration platform

We establish a database management system to construct

add

delete or modify GIS model by decompose each model into three levels items which are model level

function level and variable level. Items in each table are standard 3NF compatible

the management system links those relational tables together and provides those functions through relational operation in real time needs. A visual model construction tool is necessary in complex GIS application since it may be lack of off hand model suitable to solve the problem. We provide a GIS visual model construction tool based on the client/server system architecture and relational model based management system.