Since entering 21st century, the trend of regional economic integration of Jing- Jin -Ji is obvious day by day, on one hand , On one hand, the proposition that" the large economy of Beijing is enclosed " under the pressure of the Olympic Games with preparing for, On the other hand, the" focus" transformation to the area of the Bohai of ring with regional economic development of our country, make the economic area of the Bohai of ring with enormous development potentiality receive much concern, but the forming and development of the economic area of the Bohai of ring , make the realization of the integration of regional economics of Jing- Jin -Ji extremely urgent . In this text we look the advance of the integrated realization process of Jing- Jin -Ji as the aim, first of all, analyse the “developing area” utility that has been formed, expound that the purpose of the realization of the integration of Jing- Jin -Ji ,is letting them e the “developing area” of the region of the Bohai ring , then seek theoretical foundation and guidance of practice for integrated realization. Secondly, from the foundation and terms analyse as breakthrough point , explain the reality terms and feasible terms which Jing- Jin -Ji integration needs , prove the Jing- Jin –Ji integration has the realistic feasibility and necessity. Moreover , regard seeking the realization way with effective integration of regional