The spinal rod system is made of titanium alloy (diameter 5.5mm/6.0mm), consisting of universal snap-off staples, staples, snap-off staples, universal staples, transverse connectors and connecting rods . The variable pitch thread design is adopted, which is firmly fixed and stable. The unique plum-blossom top wire design can effectively prevent slippage during the operation, and the multi-thread design saves the time of nailing in the operation. The design of the thread and the plum blossom top facilitates the surgeon's surgical procedure.