Abstract: The purpose of this study was to investigate the effects of LED light source on chlorophyll synthesis and metabolism of Chinese flowering cabbages during storage. The Chinese flowering cabbages were packaged using modified atmosphere packaging and stored under（20±1.0） ℃ and relative humidity of 60%±5%. The cabbages irradiated by LED blue light（465±5） nm for 12 hours per day were used as LED light treatment group, and that under dark light treatment were regarded as dark treatment group, subsequently, the changes of chlorophyll contents and degrading enzymes activities of during storage were observed. The results showed that the LED light treatment could effectively reduce the weight loss rates and respiratory intensities of modified atmosphere packaging cabbages compared with dark treatment group during storage. Besides, the activities of chlorophyll degradation related enzymes including Chlase, PPH and Chl-POX in LED light treatment group were significantly decreased compared with that in dark treatment group, and the degradation of chlorophyll was delayed, resulting in the fresh color and qualities of Chinese cabbages after 4 days storage at room temperature.