In order to study the influence of heave plate on hydrodynamic characteristics of traditional spar platform,the paper took Umaine-Hywind Spar platform as a model,and used finite element software to analyze the frequency domain and time-domain characteristics of heave plate at different locations of Spar platform and the influence of heave plate with different opening rates on Spar platform at the best location.The result showed that under the same sea condition,the best location is that heave plate is placed in the lower part of Spar platform,which make the response be smaller, the property of heave plate in opening rate of 5% is better than that of 0% under the same sea condition.The result showed that heave plate can vary and optimize Spar platform.However,the influence factors such as opening ratio, spacing and numbers of plate etc on heave plate should be considered.Heave plates will uncertainly reduce the heave response of Spar platform.