With the continuous expansion of Grain Wheat processing capacity and the increase of bulk grain vehicle transportation volume year by year, it needs to promote the use of bulk grain unloading system based on hydraulic turnover in factories in order to promote the safety, environmental protection, efficiency and economy of bulk wheat unloading. Taking bulk grain unloading system as the research and analysis object, this paper compared and analyzed the data before and after the application of the system, and designed different experimental groups for the fan opening to explore the influence of the fan on the dust concentration. The results showed that the system can significantly improve the grain unloading efficiency per capita, the investment return period was short, the system design was safe and reliable, and the dust concentration during grain unloading decreased significantly with the increase of fan opening (P<0.05). At the same time, it was found that the bulk grain unloading system based on hydraulic flap can reduce the loss rate of grain transportation and help to improve grain circulation, save grain and reduce loss. The above analysis can provide reference for the application of bulk grain unloading system based on hydraulic flap in wheat processing industry, and provide new ideas for the research of bulk grain unloading in other industries.