The 7-shaped column can be used as a load-bearing column. Rectangular load-bearing columns, the main reinforcement can not play a role without effective restraint of stirrups, and stirrups must be closed to form a resultant force. 7-shaped column, the stirrups in two directions are closed and crossed to form a whole, which can be regarded as the local nesting of two independent load-bearing columns. The two columns depend on each other and support each other, and the bearing effect is also very good.