Under the background of the EEDI becoming an international convention and the vigorous development of green ship technologies, this paper proposed the concept of connecting a pair of oscillating wings alongside the ship using coil-springs to recover wave energy  through the combined motion of the ship and the wings in waves. The coupled interaction between the wings and the ship under head sea condition was solved in the frequency domain based on potential theory. A sample containership was then adopted to study the performance of the proposed concept and to discuss the influence of oscillating wings on ship’s seakeeping performance. Besides, design parameters such as connection position, spring stiffness and submergence depth were studied. The results show that the connection position and the spring stiffness are key factors to determine the produced thrust, while submergence depth has negligible influence. This study can provide some design guidance for this type of green ship.