In this paper, we studied the effects of population density and infection time of Sitophilus zenmms (Motschulsky) on the storage qualities of brown rice, such as falling number, fatty acid value and POD by SPSS method. The results showed that the fatty acid value increased and the tailing number dropped as the population density increased and the infection time prolonged; the POD activity had no obvious change in 50 days, and dropped rapidly after 50 days; the fatty acid value and the falling number changed dramatically after 30 days when the population density exceeded 100 heads per 300 gram brown rice; the falling number and the fatty acid value of brown rice samples infected by Sitophilus zeamais (Motschulsky) with different population densities had significant difference at different infection time; the falling number had significant negative correlation with the population density and the infection time; the fatty acid value had significant positive correlation with the population density and the infection time; and POD had negative correlation with the infection time.%以粳糙米为材料,设定不同的虫口密度,检测不同感染时间糙米的降落数值、脂肪酸值、POD等储藏品质指标,采用SPSS等方法分析虫口密度和感染时间对糙米储藏品质的影响.结果表明:随着虫口密度的增加和侵染时间的延长,脂肪酸值上升,降落数值下降；POD活性在前50 d无明显规律,50 d后迅速下降；虫口密度超过100头/300 g时,30 d后脂肪酸、降落数值就发生剧烈变化；不同虫口密度感染的糙米样品,其降落数值、脂肪酸值在不同感染时间呈现显著差异性；降落数值与虫口密度和感染时间呈显著负相关,脂肪酸值与虫口密度和感染时间呈显著正相关,POD与感染时间负相关.
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