Abstract: 【Objective】 To study the key parameters such as motion speed，oxygen consumption rate，feeding rate and phototropism of Crassostrea hongkongensis larvae，in order to provide references for the intensive and precise management of the artificial breeding of oysters.【Method】 The velum diameter and motion speed of C.hongkongensis larvae at different developmental stages were recorded using a Leica microscope and a micro-digital measurement and analysis system.The oxygen consumption rate and feeding rate of individual C.hongkongensis larvae of different sizes were measured by a hydrostatic test.The phototropism of oyster larvae at different developmental stages was detected according to the attractive effect of different light colors.Finally，the correlations between the above parameters and growth traits（i.e.，shell height）were analyzed.【Result】 The motion speed of C.hongkongensis larvae was 550-7500 μm/s，and it increased with the increase in shell height but decreased when the larvae approached metamorphosis.The correlation equation between shell height and motion speed was y=-0.0043x²+27.992x-1002.6，R²=0.9892.The velum diameter of larvae also gradually increased with the increase in shell height，and their linear relationship could be described as y=0.7867x-11.412，R²=0.9519.Moreover，with the increase in shell height，the oxygen consumption rate gradually rose，reaching 0.67-6.45 ng/h in a single larva.The feeding rate of larvae first rose and then declined with the increase in shell height，ranging from 35-660 cells/h.Furthermore，the phototropism of larvae differed at different developmental stages.Specifically，D-shaped larvae had tendencies to grow towards white［（29.47 ±5.75）%］，blue［（20.24 ±7.21）%］and purple lights［（19.94 ±3.90）%］，umbo larvae towards white［（24.88±7.54）%］，green［（24.10±8.31）%］and blue lights［（22.05±4.26）%］，and eye-spot larvae towards blue［（37.80±4.59）%］，white［（19.95±5.33）%］and green lights［（15.85±2.17）%］.However，the proportion of larvae tending towards red light was the lowest at all developmental stages.【Conclusion】 The motion speed，oxygen consumption rate and oxygen consumption rate of C.hongkongensis larvae are associated with growth traits to varying degrees.White，blue and green lights attract C.hongkongensis larvae to some extent，whereas red light can induce their settling.The findings of this study provide the bases for the establishment of a more precise cultivation and management process of larvae in artificial oyster breeding，including the determination of the optimal bait feeding rates for larvae，and offers data support for the construction of intensive breeding facilities.