Abstract: In this paper we study a new type of stable layers which exist frequently in the lower troposphere over South China in winter. Below the stable layer the air is cold and moist, and the wind direction is from the southwest, while a above the stable layer the air is warm and dry, and it blows from the northwest. Its formation is due to the different vertical motion distributions in the middle and lower troposphere. In the middle troposphere there is a descending motion, while in the lower troposphere there is an ascending motion. A description is given about the relation of the occurrence of this type of stable layers and the general circulation over the Far East in winter. It is found that the Tibetan plateau has an important effect on the formation of this type of stable layers.