To carry out research on the overall technology of C-band miniaturized accelerators under localization conditions, the Institute of Applied Electronics of the Chinese Academy of Engineering Physics has developed various C-band miniaturized standing wave accelerator tubes. At the same time, a C-band accelerator X-ray source system with mainly domestic components (magnetron, ring resonator, high-voltage power supply, etc.) has been established, and further high-power hot test experiments have been carried out using the accelerator as a testing platform. In the hot test experiment, the main performance indicators of the accelerator were tested according to the testing principles and methods specified in the national standard “GB/T 20129-2015 Electron Linear Accelerator for Non-destructive Testing”. The energy of the accelerator was tested using the steel attenuation method, and the focal size of the accelerator was tested using the “sandwich” method. The final test results indicate that the accelerator focal size is approximately 1.2 mm, and the accelerator’s energy can be continuously adjusted within the range of 3-4 MeV. The dose rate fluctuation of the accelerator within 20 minutes is less than ± 3%. The research results indicate that the supporting environment and overall performance of domestic C-band miniaturized accelerator can basically meet the development and use requirements of miniaturized accelerator systems.