Housing is an important factor affecting population mobility. In this paper，the author uses the “China Mobile Population Dynamic Monitoring Survey Data （CMDS）” of the National Health Commission to analyze the housing situation of the floating population in Guizhou Province. The results show that the floating population mainly rents commercial houses，followed by purchases houses. From 2011 to 2017，the proportion of purchasing house increased from 9.6% to 27.5%，and the proportion of renting commercial house decreased from 76.7% to 60.1%. The results of regression analysis show that gender，mobility range，wage level，housing expenditure，age and other variables have a significant impact on the decision of purchasing house，while gender，mobility range，education level，housing expenditure and other variables have a significant impact on the decision of renting commercial housing. Finally，the corresponding suggestions are put forward.