After "SARS", people introspect on the human settlement, and the health conception becomes the focal point of attention.The thermal environment is the important content of the human settlement and a good thermal environment is the premise of healthy city, healthy residence and people's health.In this paper, the property and affection of the thermal environment are analyzed and the principle and the way to improve the thermal environment of city residence are investigated.All play an important role in the healthy human settlement.