A new world with an unprecedented rate and a new life--network economic were created as a birth of Information network . the operating mode of the traditional regional economic was impacted and changed by the information network, information network also lets the new idea of the regional economic development ,regional economic come into the era of significant changed, traditional theory is destined to re-examine, the new theory to guide practice will come into being. by multi-regional model, we will analyze the impact on regional economic development by introducing information network and make it clear the relationship between the introduction of information network and economic welfare. Furthermore, the relationship between interregional business service and the international goods trade will be discussed.