关键词: 长期贫困, FGT贫困指数, 非匿名性

Abstract: Based on the eight survey data of CHNS, this paper studies the rural poverty by poverty headcount ratio and the squared poverty gap index. This paper gives a decompositive formula which turns the poverty change into three parts: long term poverty, relieving from poverty and returning into poverty. The empirical results are: (1)Though poverty headcount ratio of long term is decreasing, the squared poverty gap index is a little increasing. (2) Relieving from poverty is the main cause of poverty decrease, and returning into poverty is the main reason of poverty increase. (3)Compare anonymity with non-anonymity, the growth rate of the low income class is underestimated and the actual poverty is overestimated.

Key words: Chronic Poverty, FGT Poverty Index, Non-Anonymity