Abstract: This thesis conducts an in-depth study on the matching hybrid system of commercial vehicles, exploring the feasibility, advantages, problems faced and optimization design methods of its layout. Aiming at the problems such as spatial layout, weight distribution and collision safety existing in the layout process, a systematic optimization strategy is proposed, aiming to provide theoretical basis and practical guidance for the reasonable layout and performance improvement of commercial vehicle hybrid systems, and promote the development of the commercial vehicle industry towards high efficiency, energy conservation and safety.