This article focused on the youth housing policy of mega-cities in China，such as Beijing，Shanghai and Guangzhou，and uses the method of text analysis，mainly lists the current policies regard housing for young people living in big cities，and concludes that the way out for the housing dilemma facing urban youth is to encourage them to rent apartments. Therefore，the government should adhere to the policy of building more houses for rent，especially for talents and entitled groups. However，the current policy is still relatively weak，and there are some problems. Especially，both the quite narrow policy coverage and relatively strong exclusion are the most prominent problems. Therefore，makers of future youth housing policy can refer to the following four points：first，they should carry out a research of the housing needs of youth，and collect information on youth vocational and spatial distribution；Second，they should formulate special policies and regulations to fulfill young people’s housing needs，and make clear housing policy objectives；Third，they should improve public rental system，and continue to lower exclusivity of the policy；Fourth，they should regulate the rental housing market and improve the environment and system of public house renting.