Abstract: We tested the relative merits of the column cod-end and truncated cone cod-end of deep-water net cage in the same make materials and under the equal working conditions. Under the condition of flow rate of 0~0.35 ms-1, the carrying capacity, facture process and change of net clothing operation of the former were superior to those of the latter. While velocity of flow at 0~0.35 ms-1, the carrying capacity keeping rate, facture cost and change of net clothing operation of the latter were better than those of the former. When flow rate over 0.75 ms-1, the good and bad of both were not obvious.