Abstract: A smooth surface sliding system, which is adapted for incorporating with a ground vehicle impelled by a pedal driving assembly, includes a pair of supporting arms sidewardly and outwardly extended from the vehicle frame, a pair of driven units includes two driven arms movably coupled with the supporting arms respectively and two ski members coupling with bottom ends of the driven arms respectively for sliding on a smooth surface, and a steering control connected to the driven arms for shifting a downward force of a weight of the ground vehicle between the two ski members so as to increase a friction of the respective ski member with respect to the smooth surface.