'In Yunnan, there are many branches different in degrees among the 25 minority nationalities. Because of the difference on region, they formed branch culture and ethnic identity which will be of great research value. These can be regarded as subjects for studying the emergence and development of ethnic group. Methodologically, these researches can counteract weaknesses of macroscopic and microcosmic researches. Then this will promote mutual action and innovation of theory and logical demonstration on ethnology or anthology.