Abstract: The static bending performance, tension bending performance and mechanical impact resistance of 220 kV smooth aluminum sheath cable were investigated.The bending radius of smooth aluminum sheath cable was 20 times the cable diameter and the lateral pressure was 5 kN·m^-1, which can meet the installation and laying requirements of smooth aluminum sheath cable.By comparing the mechanical impact resistance of smooth aluminum sheath and wrinkled aluminum sheath cable, it can be concluded that the mechanical impact resistance of the two kinds of metal shielding cable is basically the same, and can provide sufficient mechanical protection for the cable in the process of construction and operation.The smooth aluminum sheathed high-voltage cable with new metal shielding structure meets the requirement of "intrinsically safe" of the new generation power grid.The use of smooth aluminum sheathed high voltage cable can greatly improve the safety and reliability of the system, which is the development direction of the future power grid.