Based on the dynamic monitoring data of the National Health and Family Planning Commission in 2014，this paper describes the status of housing purchasing of the floating population in Beijing，and analyzes the factors that affect the floating population to buy a house in Beijing. The results showed that 14.6% of the floating population has bought a housing unit in Beijing. Their impact on the Beijing housing market should not be underestimated. Income gap within the floating population is big.education degree differentiation is large within floating population；gender，age，marital status，income level，education level，occupation status has a significant impact on the purchase of housing.