[Objective] In the context of territorial and spatial planning, a reasonable ecological security pattern was constructed to provide references for optimizing the pattern of county territorial development and promoting the construction of urban ecological civilization.[Methods] With reference to the double evaluation work guide, the importance of ecological protection of Ruijin City, Jiangxi Province, was evaluated from the perspective of the importance of ecosystem service functions and ecological vulnerability to identify the ecological source. Based on the actual situation of Ruijin City, appropriate resistance factors were selected to establish resistance by using the least cumulative resistance model to identify ecological corridors and comprehensively construct the ecological security pattern of Ruijin City.[Results] The ecological source area of Ruijin City identified through the evaluation of the importance of ecological protection was 1 562.296 km², accounting for 64% of the study area. The administrative boundary correction extracted 13 ecological nodes, and 21 corridors were identified on this basis. The total length of the corridors was 875.94 km, and the ecological security pattern of Ruijin City, which was like "three nets and one district", was comprehensively constructed.[Conclusion] The ecological security pattern of Ruijin City constructed based on the evaluation of the importance of ecological protection, conforms to the policy tendency. It provides a feasible reference method for the optimization of the land development pattern and the construction of ecological civilization in Ruijin City and similar cities.