This research presents a device and procedure for simulating and testing the finished car controller of a hybrid power car. The device utilizes a PCI interface and a microprocessor for communication, resulting in improved reliability, high data transmission rate, and excellent expandability. By employing a mathematical model of the power unit, the system achieves cost reduction. The device includes a microprocessor unit, a PCI bus processing unit, a display unit, and an interface board card. Through connections between these components, convenient configuration of the finished car's structure, power unit parameters, operation spectrum, road spectrum, and interface board attributes are achieved, enhancing the system's versatility. When applied to testing hybrid power car controllers, this device and procedure reduce test duration and cost, while providing stable and accurate test results.