关键词: 不发达地区, 迟发展效应, 国家干预, 重点开发, 协调发展

Abstract: The expanding economic difference between UR(developing countries)and developed regions (developed countries ) has always been a serious problem that perplexed the development in the world of today. Based on the practical experience from China and the universal principles of regional development，this paper gives an analysis to the particularity of development in UR according to spatial difference ( geographic environmental differentiation ) and temporal process (late development effect). Three prerequisites are presented for the economic leap forward in UR ; deepening the economic and social reform，propelling economy forward through intellectual and technological development,and further opening to the outside world. The author affirms the important role of the effective governmental interventions to the development of UR. It is pointed out that in UR，the targets of regional development should be the permanent improvement of systematic efficiency and the optimization of the benefit at a macro and integrated level. The regional intergtated development strategy suitable to the UR was also advanced，i，e，to combine the development of key sectors with the coordinated development. The omphasis should be the penetration of economic development and the optimum combination between the development of key sectors and coordinated development，according to the specific conditions in different areas and at developmental stages- this is also a key problem in formulating a regional developmental policy for the UR.

Key words: underdeveloped regions(UR), late development effect, governmental interventions, development of key sectors coordinated development