Abstract: Microplastics, as a new type of pollutant, are widely present in urban aquatic environments, and the issue of microplastic pollution in waterfront green spaces within high-density urban cores warrants investigation. This study selected 10 urban waterfront parks within the Jinjiang Ecological Belt in Chengdu as research sites. Through systematic surveys of microplastic pollution in surface water and soil sediments, the study explored the distribution and characteristics of microplastics in the waterfront green spaces of Chengdu's high-density core area and analyzed the impact of different urban land-use types on microplastic pollution. It also assessed the risks of microplastics and proposed effective solutions to mitigate microplastic pollution. The results showed that the abundance of microplastics in surface water samples ranged from 10.73 items/L to 28.33 items/L, while in soil sediment samples, the abundance ranged from 587 items/kg dry weight to 958 items/kg dry weight. The main forms of microplastics in both water and sediment samples were particles, fragments, fibers, and films, with sizes predominantly in the range of 50~<500 μm. The primary polymer types were polypropylene (PP), polyethylene (PE), polystyrene (PS), and polyethylene terephthalate (PET). Locations with larger areas of commercial and service-oriented land use tended to have higher microplastic concentrations. By investigating microplastic pollution in 10 urban waterfront parks along the Jinjiang River, this study examined the distribution and characteristics of microplastics in Chengdu's high-density core waterfront green spaces and the influence of land use on microplastic distribution. Based on the findings, it provided urban planning recommendations to mitigate microplastic pollution in waterfront green spaces within high-density urban cores.