Abstract: Amidst the ongoing evolution of civilizational constructs, the demand for power supply reliability in the core areas of large cities is becoming increasingly high. Various high reliability new wiring modes have emerged one after another. By calculating the economy of various new wiring modes, it is increasingly important to choose a reasonable new wiring mode. By building power supply models for various new power supply modes and using the life cycle cost method, the economic viability of various new medium voltage distribution network connection methods can be obtained.