Abstract: The Gansu Tianshui Qilidun 110 kV substation was completed and was in operation in 1984. It is located in Qilidun, Qinzhou District, Tianshui City, Gansu Province. The substation is mainly responsible for the power supply of three traction transformers on the electrified railway of the Longhai Line in Qinzhou District, Maiji District, and some areas of Longnan City. In combination with the expansion project of the main transformer of the Gansu Tianshui Qilidun 110 kV substation, this article mainly introduces the comprehensive application of existing foundation testing and evaluation methods that have a long history and no clear design data; In the face of complex situations such as surrounding environment, high voltage lines in the air, and environmental electric fields, traditional, economical, and safe testing methods such as dynamic cone penetration test (DCPT), real-time kinematic measurement technology, and rebound method concrete compressive strength test are selected to analyze and evaluate the later reuse performance of existing foundation; And explained the technical characteristics and advantages and disadvantages of the three testing methods, which have good application effects.

Key words: Existing Foundation, Dynamic Cone Penetration Test, Real-Time Kinematic Measurement Technology, Concrete Compressive Strength Test by Rebound Method, Test Evaluation