Abstract: Through setting up the non-radial super efficiency DEA model, this paper conducts a mesurement of the efficiency of the endowment insurance for urban workers and the endowment insurance for urban & rural residents of China's 31 provinces and compares the regional differences, so as to further study the affecting factors. The results show that the efficiency of both the endowment insurances presents obvious regional differences: among which, the efficiency of endowment insurance for urban workers is the highest in the northeast region, the lowest is in the central region, and that in the western and eastern regions is almost the same. The efficiency of endowment insurance for urban & rural residents is the highest in the eastern region, while the differences in the northeast, central and western regions are quite close. Such factors as the level of regional economic development, the level of urbanization, the degree of aging and the size of the government public expenditures can exert important influence on the efficiency of the endowment insurance for urban workers and that for urban & rural residents.

Key words: endowment insurance for urban workers, endowment insurance for urban & rural residents, super efficiency DEA