It is the existence and development of fertility behavior of humanbeing that ensures the generation of human society,pushing forward the progress anddevelopment of society,and creating the material civilization and spiritual civilization.

Humanity s birth behavior certainly is not one kind of purely natural behavior,the different birth behavior refracts the different national culture,has reflected the different nationality life style.

On the basis of the investigationof Chinese ethnic villages by Yunnan University, this paper analyzes the micro-mechanismof the reproductive behavior of the ethnic population and reviews "modern reproductive model"guided by the macro populationpolicy.

The data from a survey for reproductive intention and behavior of the rural women showed following characteristics of reproductive behavior:fertility decreased significantly,relatively earlier reproductive age, short period of reproductive time, high abortion rate, somewhat baby gender preference.

Having analyzing the influences of several chief characteristics in the traditional family pattern on the fertility values the writer of present paper tries to explain that the relation between the reproductive behavior and the traditional fertility culture is based on the traditional family pattern .