Mesopelagic fishes are a key component of oceanic ecosystems. Feeding rhythm is important for the study of energy flow and material cycles in food webs that include mesopelagic fish. In this study, we examined the feeding rhythm of based on trawl-survey data from October 2014, on the north slope of the South China Sea, and analyzing their feeding intensity. (1) The lengths of sampled ranged from 28 mm to 110 mm, concentrated in the range of 50 to 59 mm. There was no significant relationship between body length and feeding intensity ( started feeding at about 18:00 every day (rising together with zooplankton), finished feeding at about 05:30 the next morning (sinking with the zooplankton), and fed continuously during that period. The average feeding intensity of among five sampling times, ranged from 1.50 to 2.57, showing an increasing trend. (3) There was a significant difference in the feeding intensity of between evening, and night or early morning, reflected in the comparison of three periods, namely 18:30-19:30 and 01:00-02:00, 04:45-05:50, and 06:30-07:30 (=0.007 respectively). In addition, there was a highly significant difference ( between 03:30-04:30 and 04:45-05:50. (4) The percentage of feeding intensities of among 5 periods showed a wave trend, the fourth feeding-intensity percentage had the highest value at 06:30-07:30, the zero feeding intensity percentage had the highest value at 18:30-19:30, and was half of this value at 03:30-04:30, and then decreased continuously until 06:30-07:30. In general, showed continuous feeding and egestion from evening to the next morning, while feeding was concentrated during the morning. In conclusion, a mesopelagic fish species, fed on zooplankton from evening to the next morning, with habits of diel vertical migration and egestion from 01:00 till a certain time the next day. plays an important role in material and energy flow on the continental slope of the South China Sea.