The invention discloses a motion capture method based on inertia and optical measurement fusion, and relates to the field of a sensing technology and computer vision, in particular to capture and analysis of motion processes of one or more objects. An inertia measurement technology and an optical capture technology are combined. The inertia measurement technology has the characteristics that the inertia measurement technology is insusceptible to the external environment, but problems of error accumulation, data drifting, poorer dynamic tracking performance and the like exist during measurement; the optical motion capture technology is high in accuracy but is limited by the environment such as illumination, colors and the like easily and interfered by shielding. The motion capture system and method integrate advantages of the inertia measurement technology and the optical capture technology, are low in cost, high in accuracy, small in error and insusceptible to the environment and are not interfered by shielding.