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ⅠrnSince 1990,as a person in charge of key research projects of the China Tibetology Research Center,I have had opportunities almost every year to conduct field surveys on anthropology in Tibet together with my colleagues.Our investigations focus on the family.The purpose of our surveys is to see social changes in Tibet during the 50 years after the Democratic Reform through the study of the family as a social cell.Our surveys were conducted in three different types of area:urban,agricultural and pastoral.This allows the samples we selected to be representative of Tibetan society.They can basically reflect economic and social development of all families in Tibet.