The utility model relates to an open-loop mode operation based hybrid networking power network system. The hybrid power distribution network is an open-loop mode operating circuit breaker and load switch hybrid power distribution network system. The power distribution network system comprises a plurality of substations and terminal units connected with the substations, wherein each of the terminal units comprises an intelligent controller and a communication module, an intelligent controller of each of the terminal units is connected with a circuit breaker or a load switch, the communication module of each of the terminal units is only connected and communicated with the adjacent terminal unit, and the intelligent controller of each of the terminal units collects voltage and flowing current of a circuit breaker or a load of the terminal unit itself and flowing current and fault information of the load switch or the circuit breaker of the adjacent terminal unit. The open-loop mode operation based hybrid networking power network system adopts a peer-to-peer communication network, the terminal units on the circuit are communicated with each other, fault information of the adjacent switch is collected, arbitration is carried out, and quick fault positioning and fault isolation are realized.