Abstract: Based on the Newton. s second law and the conservation law of angular momentum, the hydrodynamic equations of the SeaStation cage under the action of both waves and currents were derived, and their numerical solut ion has been obtained. Given the current velocity of 1. 5 m#s- 1, wave length of 50 m, period of 8 s, depth of 30 m, the results showed that the force of waves of heights over 5. 5 m was greater than current force, and that the force varied periodically and asymmetrically. On the contrary side the current force became dominant force. Under the same case, the maximum force decreased from the 21. 1t of sea surface to 10. 4t, when the cage lowered 5 m, so it is possible to decrease the force acted on SeaStat ion by lowering its depth. Some parameters used in the paper need verifying and modifying through further survey .