Abstract: Use the medium-alkali glass flake as the functional filler,a high solid epoxy heavy duty coating which apply for offshore steel structures in harsh marine environments was plepared.Combine the experimental design software and the experiment to optimize the coating formulation.The designed product can fully meet the requirements of NORSOK Standard M-501.The key factors affecting the properties of cathodic disbonding and ageing resistance were studied.The properties of designed epoxy glass flakes coatings was approximate to the similar foreign products,while the solid content and apply properties is better.