Abstract: When managers facing a large number of complex and uncertain marine data, how to make a choice of those data quality inspection plans has become one of important problems for application.In this paper, the rough set theory was brought into optimal selection process of the marine data quality inspection plans.Firstly, the residuals and receiving probability was discretized for each inspection plans, and the generalization value was calculated.Then computed the dependence degree of different attributes for decision, and determined the weights of each attributes.Eventually the marine data quality inspection plans were optimized for managers to choose.The method was verified by marine data of monitoring sites in a certain sea area.