The present disclosure provides a regenerative brake method of a vehicle, including selecting and inputting one of a plurality of regenerative brake modes by a driver and recognizing the regenerative brake mode selected by the driver, by a controller, determining on/off-state of an active shift control (ASC) function by the controller when the regenerative brake mode selected by the driver is an efficiency-preferred mode or an intermediate mode, controlling a motor speed during regenerative brake and simultaneously performing ASC control for changing a gear stage, by the controller when the ASC function is in the on-state, and controlling gear shift for changing a gear stage without control of a motor speed during regenerative brake, by the controller when the ASC function is in the off-state.