Three kinds of medicaments of chunleimeisu, β-aminobutyric-acid and sodium silicate inducedrice blast resistance were studied by orthogonal test for the optimum ratio of concentration in this paper. The resultsshowed that spraying the mixture of three kinds of medicaments of chunleimeisu（500μg/ml）, BABA（250μg/ml）, so-dium silicate（250μg/ml） before the occurrence of diseases had better control effect on rice blast.