This paper aims to determine the ownership of power system based on the hybrid model to meet the needs of the new power system. By modeling the traffic characteristics of different services, and combining them with the improved random forest algorithm and hidden Markov model, the accurate attribution determination of user-side services is realized. Aiming at the problem of business class change and encrypted traffic in a real environment, this paper presents an innovative hybrid model that combines a random forest algorithm and a hidden Markov model to improve the accuracy and robustness of business attribution determination.