This paper deals with the kinematics analysis for clarifying the mechanism of Ollie motions, and the motion analysis was conducted by the joint angle of snowboarder for indicating the advantage of Ollie motion in snowboarding. We used the motion sensors installing inertial sensor for measuring the motion of snowboarder. The motion sensors were attached to the body segments（upper body, lumbar, femur and lower thigh） of snowboarder. The 3D posture in local coordinate system was estimated by using the unscented Kalman filter, and the joint angles （lumber, hip and knee） was applied the inverse kinematics to the 3D posture. We conducted the motion measurement of snowboarder on the snowboard jump kicker using the motion sensors by an upper grade snowboarder and an intermediate grade snowboarder, and we analyzed by using the joint angles. These analytical results indicated the characteristics of motion by using the Ollie on the snowboard jump kicker, and the importance of Ollie motion was represented. The obtained characteristics of motion can be used for clarifying the mechanism of Ollie motion and the teaching of snowboard jump.
