The invention discloses a power system, and relates to the technical field of new energy vehicles; the power system comprises the following parts: a double-power source for providing input power to aspeed change unit; a mode conversion device used for selectively realizing power coupling between the power source and a gear; a clutch device used for controlling the power inputted into the speed change unit by one power source to be switched on and off, and synchronously and selectively coupling the gear with the power source; therefore, power is not interrupted, and any power mode can have double-power to provide output power. The invention further provides a vehicle with the highly integrated power system, so different working condition requirements can be met, and the power system has high economical efficiency.