The thermal and wet state on the ground of rural residence in Chongqing were investigated. Investigation of the rural residential and the field survey of typical residential floor were made in the season of spring and summer in Chongqing. The results showed that wet phenomenon appeared on the ground of rural residential mostly, and cement ground had the highest proportion. In June, the indoor air and ground humidity were the highest, and ground temperature was about 2℃ lower than the air temperature indoor. In wet weather, hours ratio of condensation on the ground was close to 60% in old residential buildings. Thermal performance of ground for the rural residential building should be improved.