The role of plant endogenous hormones lies in regulating plant growth and development and improving crop yield and quality,and its accurate determination has important implications for the regulation of plant growth and development,the genetics and breeding of crop,the promotion of cultivation technology and the identification of hormone residues.This article will summarize three aspects of plant hormones:the physiological action,the molecular mechanisms,the regulation of production and quality and the determination method,in order to provide reference index for the study of plant hormones.