In order to achieve a simple structure and definite transit route of load, either weld with plate or bolts connection should be provided at the section with slope change on the main member of steel tubular tower. Taking the SJ276 tower for 1 000 kV AC double circuits transmission line from HuaiNan to ShangHai, weld with plate and bolts connection are respectively applied. The economical efficiency and security of applying two connections in the SJ276 tower are analyzed. The results indicate that the tower is safe entough under two connections, while the weight of tower can be reduced about 2% by applying bolts connection.