Based on major grain prices and China’s and global geopolitical risk indices from January 2000 to December 2019,this paper employs a TVPVAR model with random volatility to empirically study the timevarying effects of geopolitical risks on grain prices in China. The results show that grain prices are greatly affected by geopolitical risks. The impact of geopolitical risks on grain prices is persistent:the soybean price is most affected,followed by the corn and wheat prices,and the japonica rice price is less affected. Different grain prices have different responses to the impact of geopolitical risks during different periods. The impact of geopolitical risk showed more of a positive affect around 2005 and 2015. Global geopolitical risks have a more dramatic impact on grain prices than that of China. Geopolitical risks in the three periods in which the September 11 attacks,the Iraq war and the SinoUS trade dispute took place had varying degrees of impact on the grain market. When September 11 attacks and SinoUS trade dispute took place,China’s geopolitical risks have a large negative impact on corn price. During the Iraq War,the geopolitical risks have a positive impact on corn and soybean prices. The impacts of geopolitical risk on grain prices last for a relatively long time,generally levelling off after one year.