This study aimed to understand the indoor environment quality and residential comfort of elderly residents in existing residential district in Beijing. A continuous investigation was carried out in a community built in the early 1990s in Qinghe. Five elderly households participated in the investigation. The study lasted from March 2018 to July 2018, covering heating season, summer and transition season. During the whole investigation period, the air temperature and relative humidity in the main rooms (bedrooms and living rooms) of each family were measured and recorded continuously. Investigators visited the households once a month. During the monthly visit, the elderly respondents were asked to finish questionnaires, at the same time, the global temperature and air velocity were measured near them. The questionnaires include instantaneous evaluation on thermal sensation and thermal comfort as well as short-term (within a month) satisfaction evaluation on living environment in their homes. In addition, the indoor acoustical environment, luminous environment and air quality of each household were also measured during the monthly visit. In heating season, despite of the cold climate outside, indoor temperature of each room was above 20℃ in general. The indoor temperature in spring fl uctuated with the outdoor temperature, and the temperature difference among the households was relatively large. In summer, the indoor temperature was mainly in the range of 25~30℃. During the whole investigation period, the relative humidity of households on the ground fl oor was significantly higher than the households on the floor above (P<0.05). In this study, the correlation between indoor and outdoor climate was observed. The hourly moisture content of indoor and outdoor air showed obvious linear relationship (R2=0.830 8). In heating season, due to the central heating, the daily average indoor temperature was not greatly affected by the outdoor temperature conditions, and was within the range of 21~23℃ on the whole. In spring and summer, people were more inclined to open the window, this led to a closer connection between indoor and outdoor climate, a signifi cant increase of daily average indoor temperature as the growth of outdoor temperature was observed. The indoor air state points were dawn in the psychrometric chart compared with the ASHRAE-55 recommended comfort zone. In the heating season, the majority of data points were located in the comfort zone due to the fulltime central heating system. However, a great number of points fell out of the comfort zone in spring and summer, for the buildings were in nature ventilation mode most of the time. PMV was calculated according to Fanger’s PMV-model. Paired-samples T test was conducted between PMV and TSV of the elderly respondents in heating season, spring and summer. There were significant differences (P<0.05) between PMV and TSV in heating season and spring. PMV was generally below zero in these two seasons, while TSV were higher than neutral in heating season and close to neutral in spring. Although the objective measurement results of indoor air temperature and relative humidity showed that majority of air state points were located outside the ASHRAE comfort zone, the actual evaluation on thermal comfort and thermal acceptability of the respondents were rather tolerant. When TSV was -1 and +1, most of the respondents still felt comfortable, and comfortable votes even occurred when TSV was +3. As for thermal acceptability, during the four-month investigation, only 4% of the samples considered the thermal environment a little unacceptable, the rest were all acceptable, among which 31% were completely acceptable and 65% were just acceptable. Current national standards stipulate the outdoor and indoor noise level of residential buildings. The outdoor noise level measured outside the window hole of master bedrooms was under the upper limit, while the indoor noise level of some rooms exceeded the limit. Only a part of rooms on the floor above met the illuminance standard of natural lighting. There were differences in level of PM2.5 and CO2 concentrations among different households, which were mainly caused by living habits (smoking, window opening).In terms of residential satisfaction evaluation, the households’ satisfaction with the effect of natural ventilation was generally high. The satisfaction with natural lighting of residents on the ground floor was low. Great difference of satisfaction in acoustical environment was found among different monthly visits, the main noise source leading to discontent was outdoor construction..