Rear wheel steering control system and method of vehicle

The present invention provides a rear wheel steering control system and method of a vehicle, which can steer a rear wheel when an ignition device of the vehicle is turned on in a state in which a front wheel steering angle is generated compared to a conventional rear wheel steering control system and method. Rear wheel steering is gradually performed at a gentle ramp-type slope for a predetermined period of time, thereby preventing rapid steering of rear wheels and eliminating a sense of disparity that a driver feels due to rapid rear wheel steering. 本发明提供一种车辆的后轮转向控制系统和方法，与常规的后轮转向控制系统和方法相比，本发明的车辆的后轮转向控制系统和方法可以当在产生了前轮转向角的状态下车辆的点火装置开启时，在预定时间段内以平缓的斜坡式斜率逐渐执行后轮转向，从而防止后轮快速转向并消除驾驶员感到的由于快速的后轮转向而产生的差异感。