A scanning system for three-dimensional imaging comprises a bench, a gantry frame, a light source, a sensor and a control unit. The bench is to support a subject to be scanned. The gantry frame is movably mounted at a lateral side of the bench. The light source is movably mounted on the gantry frame so as to emit a light for a radiographic purpose. The sensor is movably mounted at a side of the bench, by opposing to the subject with respect to the bench, so as to receive the light emitted from the light source. The control unit is electrically coupled with the gantry frame, the light source and the sensor so as thereby to perform motion controls upon the gantry frame, the light source and the sensor.
