By comparing various treatments,it is found that at E1 and E2,with the increasing application of silicon fertilizer,the specific leaf weight of rice increases first andthen decreases,and for the plots with high soil fertility,if the silicon fertilizer is excessively applied,the specific leaf weight willdecrease quickly .At E3,the application of silicon fertilizer is conducive to the accumulation of dry matter in rice leaves,和with the increasing application of silicon fertilizer,the specific leaf weight increases. In various experimental points,there are some differences between various treatments and CK .At E1 ,the specific leaf weight under various fertilizer application treatments is- 0.0010-0.0030g / cm2 higher that under ck ,an increase of-3.13%-17.25%:at E3,