In order to study the effects of organic silicon on the grass seedling morphology and physiological characters of bluegrass,Kentucky bluegrass( Poa pratensis cv．‘Midnight’)varieties was selected as tested materials,and seven organic silicone fertilizer gradient(0,1,2,2.5,3,4,5 mmol·L-1)was set up.The results showed that adding a certain concentration of silicone increased the grass seedling length,seedling dry weight,root length,root dry weight,total length of roots,total surface areas of roots and fibrous root number,and the application of silicon 2.5 mmol·L-1 had the best performance,which were significantly higher than those of the control(P<0.05).Spraying silicone reduced leaf cell electrolyte leakage,and improved grassland bluegrass resistance.Spraying different concentrations of silicone significantly improved the silicon content in the upper part of Poa pratensis L.,which 3.0 mmol·L-1 had the best effect.In summary,the appropriate concentration of organic silicon significantly promoted the growth of Kentucky.