Abstract: Abstract: With the continuous development of China's economy and improvement of the living standards, rural pastoral residents are increasingly demanding the thermal comfort of the indoor residential buildings, which has become one of the goals of the rural revitalization strategy. In the rural pastoral areas of northern China, kang is a kind of bed-like facility widely used by farmers and herdsmen to meet their daily needs and indoor heating in winter. Landed kang is the most common type used by farmers. Different types of kang in various regions are built according to folk experience. These kangs, however, are generally characterized by uneven temperature of the surface, poor thermal comfort and low thermal efficiency. Therefore, how to effectively combine natural and existing conditions to build a good thermal comfort and efficiency for farmers and herdsmen is the core issue of the research. This paper, for improving the efficiency of the traditional landed kang, seeing the smog entrance, the exit and the Kang itself as a whole research object, transforming the pillar shape and layout of the inside kang hole to change the smog flow direction and quantity of flow, combines the knowledge of building thermal engineering and fluid mechanics to analyze the distribution of flue gas flow field inside the cavity, and to improve the layout of the current fire flue. According to the principle of "front-in and rear-out", the smoke wall and guide are reasonably set. The purpose of the smoke wall is to make the distribution of the smoke flow field beneficial to improve the thermal comfort and thermal efficiency. Finally, two kang models are selected. Using the techniques of ANSYS to simulate and analyze flue gas temperature distribution for kang models of present and improved. Results show that compared with the present kang, the exhaust smoke temperature of the improved kang of I (triangle meeting wall, divided smoke wall, rear smoke wall) decrease around 10 ℃ and the coverage of high temperature flue gas near the kang plate increase by about 55%. In this way the uniformity of smog flow is obviously improved. To the second plan (wedge-shaped meeting wall, divided smoke wall, rear smoke wall), in the same way, these are 20℃ and 40%. In conclusion, the smoke flow field distribution and thermal efficiency of the large complexity kangs after the flue optimization are higher than those of the existing ones. The temperature of the flue gas near the raft is increased, and more heat of the high-temperature flue gas is absorbed by the slab, thereby increasing the temperature of the slab and reducing the smoke loss. This shows that the improved kang has been significantly improved in terms of thermal efficiency. In this way a wider range of high temperature flue gas can get to chimney flue and Kang panel, through absorbing, storing and releasing the flue gas heat to improve environment thermal comfort standard. The simulation technology used in this paper provides a new simulation method and technical support for improving the thermal efficiency of the kang, also providing a basis for the building of new kind of kang.