The broad meaning of system integration is to satisfy user requirement, and to secure and offer Hardware, Software, network, System development, maintenance, education and manpower in his own responsibility for successful business. But the basic concept of system integration is not justified and the methodology of propel procedure is not established. Therefore, in this thesis. first, We established the bagic concept of system integration in practical view. second, We modeled the propel procedure of system integration with many large project examples in view of up to date IT (information technology) view. We can enhance the compatative advantage by liking organizational strategy and IT and executing GIS project in view of system integration