Disclosed are an optical tracking system and a tracking method using the same, capable of detecting and tracking the accurate position and orientation of an object to be measured regardless of distance to the object. The optical tracking system and a tracking method using the same can broaden an available region by tracking the accurate position and orientation of an object to be measured regardless of distance to the object and can reduce the size of equipment by reducing the size of a marker unit when compared with the size of an existing marker.