With the deepening of the practice of regional integration，the theory of regional Collaborative governance has also been continuously developed. It is of great significance to understand the latest development of regional governance theory at home and abroad to guide the regional Collaborative governance of Beijing-Tianjin-Hebei. This part first reviews the realistic background of regional Collaborative governance at home and abroad，and then introduces the concept and connotation of regional Collaborative governance. Secondly，in view of the exploration of ideal regional governance mode in metropolitan area governance practice，three major schools of western regional Collaborative governance theory are summarized，namely，traditional regionalism theory，multi-center governance theory and new regionalism theory. Thirdly，the process of Beijing-Tianjin-Hebei collaborative governance is analyzed and summarized. Fourth，aiming at solve the problems of the Beijing-Tianjin-Hebei Collaborative governance，this paper puts forward specific suggestions to improve the level of the Beijing-Tianjin-Hebei regional Collaborative governance from the perspectives of straightening out the central-three government relations，straightening out the government-market relations，and establishing a multi-governance system，drawing lessons from the western regional Collaborative governance theory.