The structure adopts reticulated shell space structure system, and the cross-section of the rod member of the grid structure should be determined according to the strength and stability calculation. In order to reduce the calculated length of the pressure bar and increase its stability, measures such as adding sub-bars and support bars can be used. The nodes of the plate grid and double-shell grid made of steel are mainly in the form of cross plate nodes, welded hollow ball nodes and bolt ball nodes. The cross plate node is suitable for the grid structure of steel rods. The connection between the rod and the node plate is welded or high-strength bolts.