Abstract: Reasonable parameters for energy source systems are essential for the cost-effectiveness and economic viability of hydrogen fuel cell heavy-duty trucks. This article focuses on the parameters and performance indicators of a 49-ton hydrogen fuel cell heavy-duty truck, considering the dynamic characteristics of both the fuel cell system and the power battery system. The primary optimization objective is to minimize both the costs associated with the energy source system and the total energy consumption during driving. To achieve this, convex optimization methods are employed to align and design the power output of the fuel cell system and the power battery system. The findings demonstrate that convex optimization techniques can effectively and efficiently optimize both parameter settings and energy allocation strategies within hydrogen fuel cell heavy-duty truck energy source systems.