With the development of world economics and the increase of requirement for petroleum, many countries make great efforts to explore the oil resource deposited on sea bottom. All kinds of offshore platform are key equipments of oil exploitation. The crew workers working on them suffer serious vibration. It will bring many physical, psychology even safety problems. In this paper, the vibration of human on offshore platform is studied. Biodynamic models of human in standing posture and seating posture are built. The responses of models are calculated by numerical method. based on the models.