Salicylic acid,as a well-known signal molecule,has significant effects on various physiological processes,such as respiratory metabolism,seed germination,floral induction,senescence,and stress resistance.In recent years,great progress has been made on its effects on photosynthesis.Salicylic acid has the ability to regulate stomatal movement,photosynthetic pigment content,photosynthetic machinery and carbon assimilation,and may display different effects with different concentrations,plant species,and environments.Centering on stomatal movement,photosynthetic pigment content,photosynthetic machinery and carbon assimilation,this paper summarized the research progress on the effects of salicylic acid on photosynthesis.