In order to screen out the appropriate agricultural wastes and their application amount,which could prevent root knot nematode,six kinds of agricultural wastes including banana stems and leaves,sugarcane leaves,mushroom residue,rice straw,corn stalk and tea bran were composted and the control effect of these wastes on tomato root knot nematode were evaluated by pot experiment.The results showed that application of tea bran compost of 200 g per pot and sugarcane leaves compost of 300 g per pot had the best control effect,which prevented 80.71% root-knot nematode.The control effect of other composts increased with the increase of their application amount,except that the control effect of mushroom compost of three application amounts had no significant difference.Six kinds of composts of different application amounts all had a certain positive effect on promoting the growth of tomatoes,among which the application of rice straw compost of 200 g per pot had the best growth effect,with an average plant height of 127.44 cm and average stem diameter circumference of 3.13 cm,which were significantly better than the contrast and other compost treatments.The results of the present study could lay a foundation for the control of root knot nematode with rational utilization of agricultural wastes.