Abstract: Battery energy storage systems are widely used in frequency and peak regulation of power systems due to their advantages of accurate power output, fast response speed, and two-way regulation, but their service life is still the core restriction of energy storage systems. The adaptive comprehensive frequency modulation strategy based on battery state-of-charge (SOC) feedback was adopted. The adaptive factor was determined by the input coefficient of the fuzzy controller adjustment and the feedback coefficient of energy storage battery SOC adjustment, and the input coefficient was determined by the frequency modulation output proportion coefficient (K) of virtual inertial control and virtual droop control. The simulation model was developed with the Matlab/Simulink platform, and the actual operation data of the frequency modulation battery of a power plant was used to study different control strategies. The rain-flow counting method was used to predict the service life of energy storage batteries. Results show that the battery life with the adaptive integrated frequency modulation strategy is 25.53% higher than that with the current strategy used in power plants, and the service life is increased by 38.19% and 22.42% compared with the fixed K method and variable K method, respectively.