Plant growth regulators is a kind of similar to plant hormones have physiological and biological effect of the material.With functions of regulating plant growth and development of material have been found fresh with amine ester (DA - 6), chlorine pyrazole urea, compound sodium nitrate of phenol, ethylene, auxin, gibberellin, cytokinin, abscisic acid, br, salicylic acid, jasmonic acid, multi-effect azole and polyamine, and as a plant growth regulator has been applied in the agricultural production is mainly in the first nine categories.