Introduction to the Results: Taking a commercial vehicle as the research object, this study combines theoretical research, simulation analysis, and real vehicle testing to investigate automotive virtual test field technology. Based on this technology, a virtual prototype of the entire vehicle is established for the research of component characteristics, NVH (Noise, Vibration, and Harshness), fatigue durability, and crash safety performance. The main work completed includes: 1) Researching the modeling theory and methods of automotive virtual test field technology and establishing a virtual prototype of a certain commercial vehicle; 2) Using dynamic, nonlinear finite element methods to study the smoothness of the vehicle in the time domain and its influencing factors; 3) Employing acoustic-vibration coupled finite element method and sound radiation boundary element method to analyze and predict low-frequency noise inside the tire and passenger compartment; 4) Applying multi-axis fatigue theory and using three typical reliability road surfaces to calculate the fatigue life of the vehicle body and rear suspension; 5) Based on the GB11551-2003 frontal collision safety regulations and GB20071-2006 side collision safety regulations, a simulation study of vehicle crash safety is conducted, and feasible optimization measures are proposed. Technical indicators: 1) Technical indicators: The vibration of the vehicle meets the evaluation criteria for passenger comfort and health as per the new draft ISO2631; the acoustic sensitivity design of the vehicle can meet the design requirements; in both frontal and side collisions, the HIC value of the dummy's head is less than the regulatory standard values, satisfying the crash regulation requirements, and compared to real vehicle tests, the simulation error does not exceed 20%. 2) Economic indicators: During the project recovery period, profits exceeding 40 million RMB, foreign exchange earnings exceeding 5 million USD, and total savings exceeding 30 million RMB are created. Application of liillsE: It has been well applied at Shanghai PanAsia Automotive Technology Center Co., Ltd. During the project recovery period, it generated an additional profit of 70 million RMB, increased tax revenue by 7 million RMB, earned foreign exchange of 10 million US dollars, and saved a total expenditure of 45 million RMB.