Choosing Zhongyou 821 and Huashuang No. 3 and Beibao No. 6 as experiment materials, adopting artificial light-covered in the field, sampling and analyzing at fixed time of pod-growing phase. The paper made a preliminary discussion on the physiological effects of light density on the quality formation of rapeseed. The results showed that:1. The seed dry weight and fresh weight of the 3 cultivars decreased as the weakness of light strength. The potential of pod dry matter accumulation decreased by shading.2. ...