Aged poor population is an important problem that can't be neglected in the period of population aging in China. Based on the research about aging of the population of Nanhui, we find the mechanism that causes the poverty of the elder. According to the theory about the welfare triangle, the cause of elderly poverty is social exclusion in the three areas of the welfare triangle and the main me. In order to get rid of the elderly poverty, we should improve the symbiosis of the elder and by changing social exclusion into social integrate. |