Abstract: Gaining a deep understanding of the coupling relationship between land use changes and Gross Ecosystem Product (GEP) can provide theoretical references for local governments to achieve the coordinated development of economy and environment. Taking Jiande City, Zhejiang Province as the research subject, this paper calculates its GEP for the years 2010, 2015, and 2020, constructs a land use intensity index system, and employs a coupling coordination model to analyze the association between land use intensity and GEP and to explore its underlying mechanisms. The results show that from 2010 to 2020, the land use intensity of Jiande City has increased annually, with significant land use changes mainly occurring in forest land, arable land, and construction land. The GEP has increased by 19.293 billion yuan, with an increase rate of 36.73%. The relationship between land use intensity and GEP is transitioning from good coupling coordination to superior coupling coordination. The coupling coordination degree is rising annually, reaching 0.724 0 in 2020, showing overall positive development.