The "three electric systems" (battery, motor, and electronic control) of new energy vehicles arethe core of the vehicle's power system, responsible for key functions such as energy storage and management, drivecontrol, and vehicle control. Given the high complexity and fault sensitivity of the "three electricity system", it iscrucial to conduct system level validation and fault injection safety testing However, there is curently a lack ofsystematic and positive development of the three electric system integration platform in the industry. Relying solelyon component level testing is difficult to fully cover the diverse scenarios and warking conditions in actual operatingenvironments. System level testing mainly relies on supplier component testing and vehicle testing, which mayseriously affect the development progress and quality of new energy vehicle models. To address these issues, a newtesting system called System Level Hardware in the Loop (S-HIL) has been proposed. The S-HIL. testing systemconnects real high-voltage components of the three electrical systems with simulated exteral controlled objects, anduses real-time simulation hardware to simulate, achieving an efficient and low-cost comprehensive testing methodfor high-voltage components of the three electrical systems.