Abstract: The induced resistance is to use the method of physics, chemistry, living things, in advance to manage the plant to change the reaction to plant disease pests, former to make having a disease reaction produce the part or system disease resistance .The article emphatically introduce the plant induced disease resistance in broad outline, from after plants being induced, happening a series of physiological change in plant body to the mutual relation between many kinds of resistance disease reaction and protection reaction in plant body and so on aspects. Many studies have show that after plants being induced by induced matter some protein PR is produced in their body. Activities of their peroxidase, polyphenol oxidase, phenylalanine ferment, chitimase all increase greatly. The surrounding of plant being infected is rapidly lignificated. Two suits of gene act early or late in the course of plant induced resistance disease, they are the gene of resistance disease and the protection gene, the outcome of resistance disease gene and the outcome of virus avirulent gene have identified action, consequently, the identified action induces the gene of protection reaction to express