[Objective] Investigate recent changes in ecosystem service functions and their causes in the economic belt on the northern slope of the Tianshan Mountains. Analyze dynamic trade-offs and synergies to support new development in the region. [Methods] Analyze land use trends in the economic belt on the northern slope of the Tianshan Mountains (2010-2020). Employ the InVEST model to assess spatial and temporal changes in water conservation, soil conservation, carbon storage, and habitat quality. Analyze trade-offs and synergies among ecosystem service functions. [Result] (1) Ecosystem services exhibited a declining trend overall. Both water conservation and soil preservation initially increased before declining, while carbon storage remained relatively stable. Habitat quality scores stayed consistent but witnessed a reduction in outstanding areas; (2)Spatial distribution showcased higher concentrations in the northwest and lower in the southeast. Notably, water conservation experienced significant alterations, unlike other ecosystem services whose spatial distribution remained largely unchanged; (3) Trade-off dynamics predominantly featured trade-offs, with synergistic relationships observed between water conservation and soil preservation, as well as between carbon storage and habitat quality. Conversely, other relationships leaned towards trade-offs; (4) Evolution in spatial and temporal patterns, along with trade-off dynamics, were influenced by shifts in land use types and meteorological factors like rainfall and evapotranspiration. [Conclusion]Focus on monitoring changes in land use within the economic belt on the northern slope of the Tianshan Mountains to refine its development model and mitigate urbanization"s impact on the ecological environment.