Phytoplasmaisan is a kind of important bacterial pathogens,distributed in the world widely and caused serious yield losses for economical crops,forestry and orchard. Because phytoplasma cannot be cultured in vitro, it has brought a lot of difficulties to research. Currently,the physiological and biochemical characteristics of the pathogenic mechanism are studied at home and abroad. In this paper, the research progress at home and abroad of endogenous hormones (auxin, mitogen, gibberellin and abscisic acid) of infected plants is to be discussed.