The selection principles of backup power supply for communication base stations mainly include the following aspects: (1) Reliability: The backup power supply must have high reliability and be able to start quickly and ensure the normal operation of the base station when the main power supply fails. (2) Stability: The backup power supply must have good stability and stable output voltage and frequency to ensure the normal operation of the base station equipment. (3) Economy: On the premise of satisfying reliability, stability and environmental protection, products with good economic efficiency should be selected as much as possible to reduce operating costs.