Parallel power supply utilization system and method for electric vehicle tests

The invention provides a parallel power supply utilization system and method for electric vehicle tests. The system comprises a power battery (3), a constant voltage source (4) and a constant voltage source control system (5). The power battery is connected in parallel with the constant voltage source, and is connected with a driving motor and a power assembly. The constant voltage source and the constant voltage source control system are connected through serial ports. During the test, the power battery and the constant voltage source act together as the power source of the driving motor (2), and the voltage in the constant voltage source and a current collecting system monitor the current of the test system. When the current of the test system is close to the output upper limit of the constant voltage source, the outputted voltage of the constant voltage source is lowered through the constant voltage source control system so as to make the power battery provide power. When the current of the test system is