Satellite-derived Solar-Induced Chlorophyll Fluorescence (SIF) offers a direct approach for estimating Gross Primary Productivity (GPP). Yet, it remains uncertain if the relationship between SIF and GPP varies with photosynthetic types. This research investigated the correlations between vegetation fluorescence and photosynthesis among C3 and C4 photosynthetic types and their environmental responses, utilizing GPP data from 40 FLUXNET sites, along with GOME-2 SIF, MODIS FPAR, and CERES PAR data spanning 2007 to 2014. These findings revealed significant variations in SIF-GPP relationships across different photosynthetic types, with C4 vegetation exhibiting a steeper SIF-GPP slope compared to C3, and a 1.2-fold greater SIFyield-LUE slope in C4 than in C3; Air temperature, saturated vapor pressure deficit, and shortwave radiation had positive impacts on the GPP/SIF ratio of C4 vegetation, but adverse effects on that of C3 vegetation; For both C3 and C4 vegetation types, the SIF-GPP relationship was enhanced by crop rotation as opposed to continuous cropping practices.