Abstract: Abstract: In order to explore the ecological sensitivity characteristics of mineral resource cities and to protect and manage them in different areas, taking Datong city of Shanxi province as an example, in this paper, we selected topographic geology, cover type and water system protection from 3 aspects: natural ecological attribute, natural and social-ecological compound attribute and social-ecological attribute. The index system of ecological sensitivity evaluation was constructed by 4 types of index, considering the influence of farmland factors which were easily affected by human disturbance in mineral resource cities under the background of transition. We discussed the influence of farmland ecological factors before and after adding, and made a classification and quantitative evaluation and grading study on ecological sensitivity of Datong city of Shanxi province by means of factor space overlay mapping method and maximum method in 2015. The results showed that：1) The ecological sensitivity of Datong city was relatively high. The area of high sensitive area and low sensitive area was larger, and it was easy to cause ecosystem instability under the influence of human activity intensity or external force. The high sensitive area, ecological sensitive area and ecological low sensitive area of the urban area accounted for 25.20%, 47.10% and 27.70%, respectively. Without farmland factor, ecological high sensitive area, ecological sensitive area and ecological low sensitive area of urban area accounted for 20.60%, 36.30%, 43.10%, respectively. 2) The ecological sensitivity of Datong city was different in space, and the distribution pattern was as follows: the high sensitive area mainly distributes in the northwest, including the Xinrong district, Nanjiao district; The middle part, including the border area between Datong district and Hunyuan county, the south area of Hunyuan county; The southwest, including the border area between Guangling county and Lingqiu county. The low sensitive areas were mainly distributed in the northeast, including Yanggao county, Tianzhen county; Northwest, including Zuoyun county; the middle part, including Datong county, Guangling county; and the south part, including the central area of Lingqiu county. The middle sensitive area distributes mainly along the northwest of the terrain to the two sides of the southeast axis. 3) Farmland ecosystem had a strong response to human activities and was an important factor affecting ecological sensitivity evaluation. Adding farmland factors would affect the proportion of sensitive areas and low sensitive areas in ecology. Through the spatial distribution map of ecological sensitivity evaluation, it could be seen that the spatial distribution of ecological sensitivity changes, the low sensitive area decreases obviously, the middle sensitive area increased obviously, and the high sensitive area changed little after adding farmland factors. After adding farmland factors, there was a great difference in the proportion of ecological sensitivity area in this region, in which the lowly sensitive area decreased by 15.40%, and the moderately sensitive area and highly sensitive area increased by 10.80% and 4.60%, respectively. The results can provide important theoretical basis for ecological protection and land spatial renovation in resource-based cities, and provide scientific reference for mineral resources cities to better handle the relationship between regional economic transformation and ecological environment protection.