In view of the anti-corrosion,sealing,and overall stiffness issues of the steel structure on the top of the silo in the third and fourth phases of coal port area in Huanghua Port during operation,a structural optimization study is conducted on the silo roof structure.Two structural schemes,a concrete cone shell silo roof and an improved steel structure silo roof are proposed.The advantages and disadvantages of the two schemes are compared and analyzed.Emphasis is placed on the stress analysis and construction scheme research of the concrete cone shell silo roof structure,and the largest diameter cone shell silo roof structure and the Bailey frame steel truss+central column support system in China are proposed.The overall stiffness,anti-corrosion measures,and external maintenance plate of the improved steel structure silo roof scheme are studied with emphasis.Heavy anti-corrosion measures and aluminum magnesium manganese plates are adopted to increase the anti-corrosion protection period of the steel structure to over 30 years.The results show that both schemes can effectively solve the existing problems.