Abstract: Trichoderma is a kind of biocontrol fungi with rich resources. At the same time, Trichoderma can form a good interaction relationship with plants, promote plant growth, and induce plant disease resistance. To increase the research on the interaction between Trichoderma and plant and the biocontrol mechanism is conducive to the promotion of biological control and reduce the use of chemical pesticides. In this paper, the biological characteristics of Trichoderma and the interaction mechanism between Trichoderma and plants were introduced, and the roles of effector proteins secreted by Trichoderma in the interaction with plants were further summarized.