南诏、大理国政权对怒江流域的设置与经营 ,既打破了一些民族长期闭关自守的局面 ,加强了各民族之间的联系 ,同时也促进了西南边疆民族经济的发展 ,为中国统一多民族国家的形成奠定了坚实的基础 Nanzhao and Dali Kingdom regimes set up and operate the Nujiang River Basin, which not only broke the long-term self-retreat of some ethnic groups and strengthened the links among various ethnic groups, but also promoted the development of national economy in the southwestern frontier, The formation of the country has laid a solid foundation