Abstract: Taking the downtown area of Fuzhou as the research object. In view of Morphological Spatial Pattern Analysis(MSPA) and InVEST Integrated Valuation of Ecosystem Services and Trad-offs(InVEST), the minimum cumulative resistance model, and the gravity model, the GI network of Fuzhou City is constructed and optimized. The findings indicated that a total of 1977 core areas in Fuzhou were identified based on MSPA., accounting for 45.5% of the total area of the study area. A total of 15 green infrastructure sources were selected based on direct identification and landscape connectivity index dPC. The area of the large area GI source was distributed mainly in the suburbs. The high environmental quality area of the inhabiting area with habitat index of 0.8–1.0 occupies 59.02% and the low environmental quality area with a habitat index of 0–0.2 occupies 26.47 % of the total area of the study area based on the environmental quality evaluation model of InVEST; based on minimum cumulative resistance model and gravity model, a total of 22 corridors were identified, including 15 primary corridors and 17 secondary corridors. When the GI network was optimized, 6 green infrastructure sources and 150 nodes were added, 41 of which intersected with the railway, and 109 intersected with the highways. The distribution of green infrastructure in Fuzhou City is not uniform, and the habitat quality index is seriously differentiated, and the communication is not good. In the future construction, we should focus on the protection and construction of green infrastructure and important corridors in the downtown area.