In order to meetStheSprecision requirement for offshore Laser Communication, this paper firstly analyzed the traditional problems of atmospheric structure parameter estimation methods theoretically, and on this basis it proposed new correction models for atmospheric structure parameter estimation based on polynomial fitting and SVM. And then, a experimental platform was built under 8.9km sea-crossing condition to carry out measurement and model verification experiment, and the angle of arrival fluctuation variance and the scintillation index are obtained. The experimental results show that atmospheric structure parameter estimation based on polynomial fitting and SVM posses higher consistency than classical method, and SVM shows obvious superiority in consistency(at leastS90%) and quadraticSfit, and the important parameters can be used as a quantitative assessment of the influence of the atmosphericturbulence on offshore laser communication.