Abstract: In order to solve the problem of energy conservation for an apartment in building design, four dwellings with different space forms and modes were selected, and the actual measurement method was adopted to quantitatively teste and analyze the indoor and outdoor air temperatures and humidity and wall temperatures, combined with DesignBuilder software for simulation verifiction, and the relationship of building space modes and the indoor thermal environment was studied. The analysis showed that: 1) The greater the number of rooms on the south in a building, the lower the temperture of the apartment, and the more rooms on the north, the higher the temperature; 2) The partition between the sun room and the adjacent room was not conducive to the rise of room temperatures during days and was beneficial to maintaining room temperatures at nights. 3) The smaller the depths of directly profitable rooms, the higher the temperatures. This phenomenon was especially obvious when apartments faced southeast.