In order to provide technical support to the reinforcement for old angle steel transmission towers, studies of the effects on the ultimate bearing carrying capacity of angle steel leg member under different reinforcement methods were conducted. In this paper, two main reinforcement methods of fixture and perforation types for angle steel leg member were proposed. The failure mode, bearing capacity and reinforcement effect of reinforced members are studied under different reinforcement methods, reinforcement positions and connector spacing by static load test and parametrization finite element simulation, and then the reinforcement mechanism of members is analyzed. The results show that: the finite element simulation results are in good agreement with the test results, the ultimate bearing capacity and damage pattern are similar to the test results. The reinforcement changes the damage pattern of the original member, from overall instability to local instability. The bearing capacity is increased by about 7 % ~ 8 % when the two ends of the reinforced member are connected, and the reinforcement effect is doubled after the middle connection is added. Both types of reinforcement are effective in increasing the bearing capacity of the elements, and with the addition of intermediate joints increasing the bearing capacity even more significantly.