The amount of quantum keys generated in real time for traditional quantum security communication systems is limited. It is difficult to adapt to different security levels and communication characteristics of business data such as electricity production scheduling

marketing and management informatization. It is impossible to achieve accurate data protection for various types of power service data. The importance of power business data asset and the data transmission requirements are analyzed. Aiming at solving the lack of indiscriminate quantum key replenishment strategy for each business of traditional quantum virtual private network(VPN)

the quantum key update frequency calculation method

key replenishment strategy and optimal allocation strategy model with adaptive power business attributes are proposed. The problem of the traditional quantum VPN adopting non-differential quantum key update frequency for each service is solved. Experimental results show that the method can realize the automatic and intelligent optimization of the quantum key distribution for the accurate data protection of various power services. A precise and secure data protection mechanism based on quantum key could be built by the proposed method.