Abstract: In our report, Jinjiang City was used as the research area, based on the land use data in 2016, patch area index, patch shape index, and patch dispersion index were used to construct the cultivated land fragmentation index system, with which to evaluate the degree and spatial distribution of cultivated land fragmentation in Jinjiang City under in-situ urbanization from different scales. Then, based on the spatial autocorrelation results of cultivated land fragmentation, combined with geographically weighted regression model and geodetector method, the influencing factors of cultivated land fragmentation were analyzed. The results showed that the overall fragmentation of cultivated land in Jinjiang City is at a moderate level of fragmentation, with a global Moran index of 0.382 7, which has a certain positive spatial correlation, showing obvious spatial agglomeration. The influences of elevation, slope, and rivers on the fragmentation of cultivated land are mainly positive, and residential areas and traffic are mainly negative. Among the land types, the impact of construction land on the fragmentation of cultivated land is the most prominent. Fragmentation and high agglomeration areas are basically within the main influence range of various factors, and each factor has a significant impact on the spatial agglomeration of arable land fragmentation. Among the selected factors, the natural factors（elevation, slope, and river） and human disturbance activities（residential areas, traffic, and land use types） have significantly different effects on the spatial differentiation of cultivated land fragmentation. The natural factors（elevation, slope, and river） were the main reason for the fragmentation of cultivated land in Jinjiang City, and the combined effects of residential areas and natural elements can increase the degree of fragmentation of cultivated land.