Abstract: The paper study the influence of the oscillating center pipe structure on the energy conversion performance,and obtain some methods to improve the wave energy capture performance.Design and test three models of center pipe with various diameters.Furthermore,the effects of anchor position and nozzle ratio on the capture performance of the model are studied.The experimental results show that the ratio of the center tube area to the base area is directly related to the maximum capture width ratio of the model.The anchor chain is attached to the bottom of the tank,which can make the model more stable and capture effect better.The capture width ratio is maximum when the nozzle area ratio is 2%,and the pass-band widens with the increase of the nozzle ratio.