Abstract: Floor type large steel silo is to solve the storage problem of fly ash in power plants. It has the characteristics of large storage capacity, low investment, fast construction speed, high ex warehouse efficiency, long service life and so on. Steel silo has been developing rapidly in China recently. As an emerging industry, the development process of steel silo industry still lacks corresponding national norms. This paper is based on a project of 100000 M ³ Taking the steel silo construction project as an example, the cylinder structure is calculated according to the national code gb50884-2013 technical code for steel silos, and the structural analysis is carried out by using ANSYS finite element analysis software to compare the stress change and deformation curve of the cylinder, optimize the structural design, and improve the safety and economy of the steel silo.