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The foot and ankle joint is complex and important in human joints, so it is important toward improving research on the motion of the foot and ankle joint by restructing the accurate kinematic model of the foot and ankle. This research used two surface model: bony landmark set mosel and marker triad model. Placeing two model on foot and ankle that be assumed to three rigid body including tibial segment, hindfoot, and forefoot. Euler angle method and instant screw axis method are employed to describe the relative angular motion of foot and ankle durning stance phase in this study. The results are similar to the previous research, namely the reliability could be accepted. For ankle joint, bony landmark set model is better than marker triad model on standard deviation, but repeatability that was produced by marker triad model is better. For midtarsal joint, the bony landmark set model is better whether standard deviation or repetability. In other words, bony landmark set model could be used to research the angle motion of midtarsal joint, but marker triad could be utilized to research the angle motion of ankle joint after improving the size of marker triad.
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