In a greenhouse experiment,different doses (0.15,0.25,0.50 mL·L^-1) of compound sodium nitrophenolate (CSN) were used to spray the Chinese chives cultivar ‘Dajingou’ on the 12th day of post-harvest.The effects of CSN on yield,nitrate metabolism and quality was investigated after different treatment days (0,3,6,9,12 d).The results showed that:(1)The time dynamic patterns of nitrate concentrations had simple valley values,which appeared on 6 d,and the reduction by 29.6% occurred for 0.15 mL·L^-1 CSN in comparison with control.(2)This significant decrease was accompanied with elevated activity of nitrate reductase(NR),glufaminc synthctasc(GS),glutamate pyruvate transaminase(GOT) and glutamate oxaloacetate transaminase(GPT) by 34.4%,61.3%,208.8% and 7.4%,respectively.(3)The increase in yield by 10.7% for dry matter and 10.8% for fresh matter accompanied with an increase in free amino acid by 23.1%,soluble protein by 23.3%,and Vc by 0.5% in CSN treatment compared to control.According to the results obtained,CSN obviously enhanced the activities of NR(which was named as ‘driving-pump of nitrate reduction’) and GS(which was called ‘first-driving-pump of nitrogen assimilation’),and might also promoted contribution of free amino acid,dissolvable protein and Vc by transamination action of GOT and GPT(which were called ‘second-driving-pump of nitrogen assimilation’) to reduce nitrate accumulation in vacuole of Chinese chives cells.