Abstract: A field plot experiment was conducted in Tianjin to study the effect of different ratio organic nitrogen and inorganic nitrogen fertilizer on yield, quality of celery and soil nitrate content. The results showed: the different ratio of organic nitrogen and inorganic nitrogen could increase the yield, improve the quality and decrease the soil nitrate content. In this study, yield of 50% ratio of organic nitrogen treatment was 121327 kg/hm2, higher than other treatments, contracted with 100%N treatment, increased by 9.01%; the Vc content was 108.6 mg/kg, increased by 53.82%; nitrate of celery was 1644.4 mg/kg, decreased by 36.48%. With the ratio of organic nitrogen increased, soil organic matter was increased and soil nitrate content was decreased after celery was harvested.