Spatiotemporal analysis of Ocean Primary Production (OPP) is highly important for monitoring, conserving, and sustainable development of marine environment and ecosystems. Because of the influence of several factors such as temperature increasing, nutrients, wind and ocean dynamics, the analysis and prediction of the seasonal evolution and interannual trend of OPP have become more difficult and challenging. Taking the South China Sea (SCS) as the study area, this research conducted the comparative analysis of three widely used models in the SCS and identified the Vertical Generalized Production Model (VGPM) as the optimal model (R