A dynamic motion detection system including a plurality of active independent emitting elements, a signal capturing apparatus, and a computing apparatus is provided. The active independent emitting elements are suitable for being respectively affixed to different parts of a person to-be-tested and actively emitting positioning signals having preset wavelengths. The signal capturing apparatus is configured to capture the positioning signal of each of the active independent emitting elements and calculate a plurality of emitting coordinates according to the positioning signals. The computing apparatus is configured to control operation of the signal capturing apparatus and receive the emitting coordinates from the signal capturing apparatus. The computing apparatus defines a corresponding relationship between the emitting coordinates and the active independent emitting elements by comparing a geometry relationship among the emitting coordinates.