Abstract: Depending on hurdle movements as the study case, the research analyzes the influence of manual digitizing error on analysis results. The result shows that under the premise of clearly visible for cameras, all the body landmarks can obtain reliable result. After 3D reconstruction, the vertical direction is slightly less variable than the other directions. Additionally, the precision of linear displacement can match the analysis requirement, while angular velocity displays poor reliability no way. Some of the parameters, is greatly influenced by data smoothing.

Key words: error, motion analysis, quantitative analysis, minimum standard deviation