Abstract: Abstract: Based on the virtual prototyping technology, the multi-body dynamics analysis of a certain type of battery bracket carrier vehicle was carried out, and the full-load flat road and full-load climbing 10 were obtained. Kinematics and dynamics parameters of slope and full-load low-speed road through 100 mm trench under three typical working conditions and the stress state of each component. Based on the worst simulation results of the third trench road condition, the strength of the whole frame is analyzed in the finite element software, and the defective parts of the front, middle and rear frame are found out. The stress concentration is reduced by increasing the structural stiffener plate, reducing the thickness of the plate and opening the weight reducing hole. The structural strength of the rack is improved, and the total weight loss of the three racks is 22% under the premise of meeting the service requirements and allowable stress of the materials. After more than one year of industrial test in coal mine, the frame strength fully meets the requirements of field use, which provides a reference for dynamic analysis and structural optimization design of similar vehicles