Global warming is expected to have a profound impact on the driving mechanism of the Zhoushan coastal upwelling, and then affect the changes in the ecological environment and fishery resources in the sea. Using the three-dimensional numerical ocean model FVCOM, we simulated and studied the distribution characteristics of summer hydrodynamics and environmental factors in the upwelling zone of Zhoushan coast under the changes of heat flux, wind field and other climatic and environmental factors. The effect of global warming on the summer sea surface temperature in Zhoushan and its neighboring waters over the past three decades was assessed by introducing a transition test, and it was found that a significant leapfrog occurred around 2016, and the sea surface temperature increased by about 1℃ after the transition compared with that before the transition; the results of heat flux analysis showed that the increase of seawater heat content due to the decrease of cloudiness and the increase of short-wave radiation in spring was an important reason for the warming of seawater in summer; the spatial and temporal variations of wind speed show that the wind speed in Zhoushan sea area in July had a tendency to weaken in recent decades.The results show that the enhanced stratification of seawater caused by the increased heat absorption of surface seawater and increased advective heat transport caused by the increased heat flux of sea air makes the bottom seawater difficult to uplift; the reduced wind stress in summer weakens the offshore expansion of the low-salinity tongue of the Changjiang Diluted Water, resulting in a weakening of the stratification of seawater upper layer in the upwelling zone, thereby strengthening the ascent of the middle and lower layers of seawater towards the shore and increasing the intensity of coastal upwelling.