The multi-nationality society of Yunnan has made considerable headway since 1949 when the People’s Republic of China was found, especially since the reform and open policy was implemented. However, it is poor at historical foundation and geographical conditions. And it’s binary structure is outstanding. So, the level of total development is not high and occupies the later place in the country. The development of different areas in the whole province is in a state of imbalance. The problem of a sluggish growth in many aspects is more outstanding than the backwardness of economy. The writer thinks that reducing the distinction in social development is prior to reducing the regional distinction in China. The writer also offers positive suggestions for guiding ideology, total goal and development thinking in order to accelerate the development of multi-nationality society of Yunnan.