6-BA and GA₃ combined treatment were used to spray leaves of Celery.By doing so,we could select the best combinations of 6-BA and GA₃,which increase the chlorophyll content,enhance leaf photosynthesis,synthesize more organic of greenhouse Celery.Results of the study showed that leaf chlorophyll content,leaf photosynthetic rate,stem diameter,plant height and plant fresh weight of celery in greenhouse were effectively increased by 6-BA and GA₃ combined treatment.The treatment of 200ppm 6-BA + 10ppm GA₃ had an obvious effect on the celery,which increased 110.0%,14.7%,57.9%,38.5% and 15.5% compared with the contrast.