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Spin is a kind of complicated, dangerous and abnormal flying state when airplane stalls in the air. Spin and recovery research is usually done in vertical wind tunnel test, and the measurement method is the key technology in the test. In the past decade, the technology of binocular stereo vision, coded markers image recognition and inertial navigation measurement has been adopted. In the process of continuous improvement, the measurement ability and data quality are also put forward higher requirements. Therefore, a new measurement method of 6 DOF in spin test based on combination of optics and inertia technology has been developed, and it measures attitude by inertial system and position by optical system. After test verification, the method successfully obtained 6 DOF data with high measurement efficiency and no data loss. The spin radius could be obtained by the projection of model trajectory on the cross section of wind tunnel test section, which increased the cognitive dimension of spin phenomenon.