The construction of ecological security patterns constitutes an effective approach to maintaining regional ecosystem service stability, which is of great significance to promote regional sustainable development and ensure human well-being. However, the existing research pays less attention to the construction method of ecological security pattern suitable for suburban areas, especially in the context of imbalance between supply and demand of ecosystem services and ecological sensitivity, ignoring the comprehensive consideration of ecological protection needs and human settlements quality in the identification of ecological sources. Taking Liuhe District of Nanjing as an example, from the aspects of supply and demand of ecosystem services and sensitivity analysis, the InVEST model and the Ecosystem Service Demand Ratio (ESDR) quantitative analysis method were used to extract the ecological sources with high level and potential of ecosystem service supply. Multi-factor indicators are integrated from the two dimensions of ecological risk and external interference to characterize the level of ecological sensitivity, and landscape elements with high sensitivity but complete ecological functions are identified as ecological sources. On the basis of source coupling, the ecological resistance surface is constructed, and the ecological corridors, ecological pinch points and obstacle points are extracted by using the minimum cumulative resistance model and circuit theory, and the ecological security pattern construction system for suburban areas is formed. The results show that in the process of extracting ecological sources in suburban areas, insufficient integration of ecological sensitivity indicators would omit 59.50% of functional ecological elements. These elements show sensitivity due to highly dispersed interference sources, but still maintain complete ecological functions. A total of 15 ecological sources were identified in the study area, with a total area of 267.99km2, accounting for 20.59% of the study area. Spatial distribution exhibits "midwest-dense, east-sparse" clustering, and the main land use patterns are forest land and cultivated land. At the same time, 30 ecological corridors are densely distributed in the east and north. The short-distance corridors are mainly located in the north and west, while the medium-long-distance corridors are distributed in the east. The ecological pinch points are mainly concentrated in the medium-long-distance corridors in the north, middle and east of the study area. The ecological barrier points are mainly distributed in the long-distance corridors in the south. Based on this, this study puts forward the proposes an "Five Districts and Four Corridors" ecological restoration framework in Liuhe District of Nanjing, and provides a new idea for the application of the ecological security pattern planning methodology system in suburban areas.