plant growth regulators is a class of plant hormones and have similar physical and biological effects of substances. Have been found with the regulation and control of plant growth and development of functional substances auxin, gibberellin, ethylene, cytokinin, abscisic acid, brassinosteroid, salicylic acid, jasmonic acid and polyamine, etc., and as a plant growth regulator was application in agricultural production is the first 6 major categories.