For a certain hybrid vehicle thermal management system, based on the overall vehicle thermal management architecture, a one-dimensional simulation model is established. Using the system outlet water temperature as a safety indicator, the heat dissipation performance of each subsystem under different driving conditions and the thermal interference effects of high-load air conditioning operation on the system are analyzed. The study constructs an integrated model including engine cooling, battery cooling, and the air conditioning system, and conducts simulations under 5 typical driving conditions. It reveals the thermal coupling effects among the high-temperature radiator, condenser, and low-temperature radiator in the front-end cooling module, and proposes a compressor and battery water pump fitted speed control strategy based on energy consumption optimization. Results show that under all conditions, the outlet water temperatures of all radiators remains within safe thresholds, confirming the feasibility of the system design. After adopting the fitted speed control strategy, the total energy consumption of the system decreases by 35.8%, 12.0%, and 6.1% at ambient temperatures of 30 ℃, 35 ℃, and 40 ℃ respectively, compared to linear control. The study demonstrates that through coupled thermal management modeling and energy consumption optimized control, the thermal management efficiency of hybrid vehicles can be effectively improved while ensuring system safety.