A three-coordinate measuring system includes a three-coordinate measuring apparatus, and a type collector for a product to be measured; the apparatus is provided with a probe, and a control component which controls motion of the probe through a measuring program preset according to product type of the product to be measured, the control component is electrically connected to the probe; the type collector includes an optical collecting head capable of scanning a graphic identifier, the optical collecting head is electrically connected to the control component; the control component acquires the product type of the product to be measured according to the graphic identifier scanned by the optical collecting head, and call a corresponding measuring program to control the motion of the probe in order to measure the product to be measured and acquire measuring data, a method for three-coordinate measuring is also provided.