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In response to the low energy utilization efficiency and high power transmission loss of hybrid electric vehicles, the hydraulic control system of hybrid electric vehicles was studied. Conducted fluid dynamics analysis on clutch dynamics, safety valve status, and hydraulic control system. The hydraulic control system of P2 hybrid electric vehicle was designed and studied using working condition analysis and parametric design concepts. The unique feature of this design is that it changes the switching mode of different working modes of the vehicle. After experimental testing, the pressure of the safety valve can stabilize at 16 bar when fully opened, and the control system can switch working modes using the clutch, effectively improving the energy utilization efficiency of the car and reducing losses during power transmission. The hydraulic control system designed through research has improved the driving experience of new energy vehicles and achieved energy conservation and emission reduction.