Abstract: With the launch of China's "3060" strategy, UHV as a new infrastructure and related supporting transmission lines has significantly accelerated the construction speed. However, due to the shortage of land resources, the topographic and geological environment of the transmission line channel is getting worse and worse. Coupled with the frequent occurrence of extreme weather in recent years, the damage to the transmission tower also occurs from time to time. Most of the transmission towers will not collapse immediately after being damaged, but will still "operate with faults". Therefore, it is very important to evaluate the performance of the transmission tower in "fault operation". The rapid evaluation of the bearing capacity of the transmission tower after some members are damaged, or the external load conditions (such as wind speed, settlement displacement, etc.) that can still be withstood, becomes an important basis for the decision-making of the operating unit and the designer. Some members of the transmission tower are damaged, or the external environmental conditions are changed (such as three spans), which will cause the stress of some members of the tower to exceed the design strength. Therefore, how to strengthen the components of the transmission tower quickly and non destructively has become the focus of attention in the field of engineering design. In this paper, the performance evaluation and reinforcement simulation calculation are carried out for the towers in some practical projects, in order to provide engineering experience for the follow-up projects.