In view of the contradiction among the technology requirements,environmental protection,buildings’fire protection and structure scheme in the process of the project implementation of large-span dry-coal shed in port,we carry out the optimization design and research on it. Comparing the technology,building and structure scheme,we draw the conclusion as follows:the project investment cost of semi-closed dry-coal shed with lower column is the minimum；the totally-enclosed dry-coal shed with 4 m-high column has the maximum coal storage,better usability,high degree of automation and better effect of environmental protection.