Two fermentation methods,solid fermentation and liquid fermentation,were used to get Botrytis cinerea coarse extracts.The inhibitory effect on the seedlings growth and root length of wheat,sorghum,rape and cucumber of the two coarse extracts were studied.The two coarse extracts inhibited growth of the four tested plants seedlings and roots completely at concentration of 20 mg/mL,and both of the minimum effective in hibitory concentration were 0.62 mg/mL.At the same concentration（5 mg/mL）,the inhibition to wheat seeding growth of the liquid extracts was higher than the solid extract.But to cucumber seeding growth and sorghum roots growth,the inhibition was lower than the solid of（p＜0.05）.There were no difference between two extracts in in hibition totherootsgrowth ofwheat,cucumber,rape and theseedinggrowth of rape and sorghum（p＞0.05）.The results indicated the two coarse extracts of B.cinerea both have strong herbicidal activity,but the solid has wider development prospect than the liquid because of its in expensive raw materials and simple of operation.