Chen Xi, Associate Professor ，School of public administration, Liaoning University，doctorate in Population, Resources and Environmental Economics. Lecture Courses including “international comparison of social security” and “Theories and Practices of Social Security System”. Researching on the moderate level of pension contribution, national pooling of pension and social security coordination between urban and rural. National Social Science Foundation project and Provincial-Level projects host. Participant of an National Natural Science Foundation key project of China,two National Social Science Foundation major projects and some national projects.Winner of the excellent doctoral dissertation and first prize of achievement in philosophy and social science.More than ten articles has been published in journals of Chinese Social Sciences Citation Index,such as Chinese Journal of Population Science.