The celery was treated with O_3 water divided into four groups (non-treated and unpacked group, treated and unpacked group, non-treated and packed group, and treated and packed group). In the storage period, six parameters were detected such as color, water loss, respiration intensity, withering rate, the content of vitamin C and the POD activity after every seven days to find a suitable storing method and the fresh keeping effect. The results of the experiment showed that after O_3 water treatment, the water loss, withering rate and respiration intensity could be effectively reduced and the storage time of celery could be prolonged.