Abstract:[Objective] An ecological security pattern at Zhangjiakou section of Bashang Plateau region was constructed,and key ecological elements and their spatial optimization directions were identified,in order to provide scientific basis for stabilizing the ecological barrier in the upper reaches of the river and for the management of ecological space. [Methods] Ecological sources were identified by evaluating ecosystem services including water conservation,carbon storage,habitat quality,and soil conservation,combined with ecological sensitivity assessment and morphological spatial pattern analysis （MSPA）.A comprehensive resistance surface was constructed based on the minimum cumulative resistance （MCR） model and circuit theory to extract ecological corridors,ecological pinch points,and barriers.On this basis,ecological security zoning and pattern optimization were performed. [Results] High and relatively high ecological security zones in the Bashang region covered an area of 5 423 km2,accounting for 39.4% of the study area.A total of 21 ecological sources （430 km2）,50 ecological corridors （with a total length of 1 600 km）,and 127 ecological nodes were identified.These nodes included 36 ecological pinch points and 91 ecological barriers.The overall spatial pattern was characterized by the aggregation of sources and corridors in high-security zones and the concentration of barriers in low-security zones. [Conclusion] The ecological security pattern of the Bashang region exhibits significant spatial differentiation.Highsecurity zones serve as core areas for maintaining regional ecological connectivity and stability,while middle-and low-security zones are key areas affecting ecological flows.The proposed“five zones and three belts”framework can effectively coordinate source protection,corridor connectivity,and priority restoration areas.