The present invention provides a variable aerodynamic system for a vehicle. The system includes an active air skirt, an active rear spoiler, and an active rear bumper spoiler of which one or more are selected and deployed by a controller, while a vehicle is running, when the controller receives information obtained by a detector, and determines that the obtained information satisfies conditions inputted in advance by comparing the obtained information with the conditions inputted in advance. The height from an end of a front bumper to a front wheel center is within a predetermined value.