Abstract: A wave powered buoy with oscillating water column and conical central tube was presented in this paper. Firstly,the structure and working principle of buoy were introduced. Then three model schemes are designed.The mathematical model of forced motion of buoy under incident wave was established and the numerical simulation was carried out. The hydrodynamic parameters such as additional mass,damping coefficient,wave excitation force and motion response of the buoy under the design condition were obtained.Finally,the capture width ratios of each design scheme under different periods were collected through physical model tests,and compared with those obtained by numerical calculation. The results show that the buoys of different design schemes adapt to different water depth conditions;The maximum value of capture width ratio of model 1 in the design scheme is 47.8%.