Tomato seeds were pretreatment with the different concentrations of the product of Trichoderma and the result showed that the germination rate and vigour index of tomato seed were notably increased,and the pretreatment with 1∶100 and 1∶1?000 dilution rate was the most effective.Effects of Trichoderma on seedling growth of tomato were positive and the length of hypocotyls and the number and weight of crown gall were enhanced;the fresh weight of leaf,stem and root system of Trichoderma was also increased.