Drawing upon the CHNS data and using unconditional quantile regression and dynamic decomposition methodology，the paper examines the income differentials and over-time changes between urban residents and rural migrants in Chinese cities from 1989 to 2009. Results show that the income gap has considerably widened during the past twenty years. While the widening income gap in the 1990s was mostly attributable to changes in wage structures effect ( discrimination) ，the major determinant of the rising income gap after 2000 is changes in labor market segmentation. Thus，policies addressing labor market segmentation and discrimination and improving educational level of the migrant workers are of fundamental importance to reducing the income gap.

Drawing upon data from China Health and Nutrition Survey(CHNS) 2009,this paper analyzes health status and its determinants of 1291 children under age 18 using OLS/quartile regression.Results show that child′s sex and the proportion of male children in the family significantly associated with child health.After controlling for physiological and genetic factors,geographic location of the family,the family′s long-term welfare level,father′s education level,types of occupations of the parents and age of children are significantly affecting child health.