Dump trucks typically utilize diesel fuel, resulting in significant emissions of nitrogen oxides and particulate matter in their exhaust gas, which contributes to substantial environmental pollution. To support the strategy for achieving carbon peak and carbon neutrality, this study focuses on the range extended electric dump truck, using methanol as an alternative fuel to diesel. After completing the performance test of the M100 methanol range extender, the operating point of the range extender is determined. Considering the design requirements and performance indicators of the dump truck, the parameter design for both the power system and drive system is completed, and the 4-speed AMT is matched with the drive motor. The acceleration performance and fuel economy of the dump truck are simulated using AVL CRUISE. The results indicate that the acceleration time from 0 to 50 km/h is 7.73 s, and the maximum gradeability is 45.92%, the acceleration performance satisfies the design requirements. Under the CHTC-D cycle, the dump truck methanol consumption is 70.66 L/100 km, the electric energy consumption is 1.05 kWh/km, the equivalent diesel consumption is 29.79 L/100 km, and the driving range is 425 km, the fuel economy also satisfies the design requirements. The research on acceleration performance and fuel economy of the M100 methanol range extended electric dump truck lays a foundation for the future formulation and optimization of the control strategy for the range extender.