Mixed matrix membranes (MMMs) combine the excellent processability of polymers and the high selectivity of porous fillers, which have important application prospects in the field of gas separation. However, the poor interfacial compatibility between fillers and matrix and filler aggregation problems have limited their further applications. In this study, a series of high-performance MMMs were successfully constructed using βketoallylamine-modified covalent organic framework materials (TpBD) as fillers and 6FDA-ODA polyimide as matrix resin. Based on the hydrogen bonding effect between TpBD and 6FDA-ODA, the MMMs show good thermal stability (glass transition temperature (T_g) of 295 ~ 305 ℃, T_5% of 499 ~ 503 ℃, T_10% of 530 ~ 534 ℃) and mechanical properties (tensile strength of 49~68 MPa, elongation at break of 6.35% ~9.12% ). Among them, the 5% TpBD / 6FDA-ODA membrane exhibits excellent gas separation performance with CO₂ permeability of 21. 48 barrer and CO₂ / N₂ selectivity of 24.13, which are 79% and 20% higher than those of the pure 6FDA-ODA membrane, respectively, and the synergistic optimization of permeability and selectivity is achieved. This study provides a new idea for the development of MMMs with both high stability and efficient separation performance.