A sideslip test for a vehicle that can make a database of sideslip and objectively measure the sideslip. A sideslip test system may include: a driving road provided to drive a vehicle; a support beam disposed to be supported on the driving road; a distance sensor mounted on the support beam to measure a distance from the vehicle; and a display device connected with the distance sensor and visualizing a measurement value of the distance sensor. A sideslip test method may include: entering, by the vehicle, the driving road; sensing a distance between the distance sensor and the vehicle; converting data to express the distance sensed by the distance sensor as a coordinate; collecting a closest Y-axis distance between the distance sensor and the vehicle as a representative value; and expressing a distribution of the representative value as a graph through the display device.