Abstract: Based on multi-source remote sensing data, this study constructs a comprehensive evaluation model of natural environment comfort of urban living with the help of principal component analysis method and take the Beijing-Tianjin-Hebei region as an example to evaluate the changes in natural environment comfort under the background of urban development in 2000,2010 and 2020.The research results show that :1) the over all comfort level of urban residents in the Beijing-Tianjin-Hebei regions gradually improving, as from the city center to the city periphery, with an increase of about 10%; 2)compared with 2000, the comfort level of district and counties in 2020 is also improving yearly, and the number of high-comfort districts and counties has nearly doubled; 3) The change of comfort level in typical cities is generally consistent with the overall change, but there are differences in the speed of improvement due to city functions and scales. This study has certain reference and application value for promoting sustainable development of cities.