Using the youth survey data collected in November 2009,we examine intergenerational relationship between only child ages 20-34 and their parents in urban China,in comparison with that of adults with siblings in same age cohort.Results show that only child is more likely to co-reside with parents and get more economic support from parents,but there is no significant difference between only child and their counterparts with siblings in providing parents with economic support and emotional contact.Employment,marital status and childbearing have important effects on intergenerational relationship by raising the probabilities of children living apart from parents,getting less help from parents,having less contact with parents and offering more economic support for their parents.Implications are discussed in the paper.