Taking the Hebei section of the Taihang Mountains as the research object, the Remote Sensing Ecological Index (RSEI) is calculated to identify the ecological source area. Multiple spatial data sources such as the land use type, normalized vegetation index, elevation, and slope are selected for comprehensive resistance evaluation. The circuit theory model is used to extract ecological corridors and pinch points, and a long-term regional ecological security pattern of "source area corridor node" is constructed. The results show that: (1) The average RSEI of the study area in 2002, 2007, 2012, 2017, and 2021 are 0.507, 0.538, 0.554, 0.493, and 0.541, respectively, and the RSEI shows a trend of "rising-falling-rising" over the past 20 years; (2) The total area of the source area in the research area increases gradually, with an increase of 5705 km² from the initial stage to the final stage. The proportion of area increases from 2.66% to 18.56%, and the average RSEI of the source patches increases from 0.774 to 0.834; (3) The main ecological corridors in the research area are distributed vertically from north to south. At the end of the study, 16 ecological source areas, 21 ecological corridors, and 5 ecological pinch points are identified.