With the reality of computer is the network

through the platform

accessing the information

particular geoinformation independent of data structure

semantic and so on is the dream for the users. Inter-operating GIS is the hot topic due to the useful way to realize it. In this paper

we focus on the overview of inter-operating GIS. Technology interoperation is to access and share geodata

service interoperation is to access useful geoprocess and operation

and semantic interoperation works on how to get the true geodata and geoprocess what the user want. Technology

methodology

state and drawback have been present in these four aspects. Finally

the future of inter-operating GIS is expected.