Abstract: Human movement is achieved under the control of the "nerve-bone-muscle" mechanism. This mechanism based on the environment information and the information requires visual sampling. There are many reports about the mechanism's feedback of changing visual sampling, but no studies have been made on the knee joint kinetics on visual environment changes in 3-6-year healthy children. In order to understand the influence of visual condition on motion, the method of motion time has been used and the feedback of the healthy children aged 3-6 years under the condition of visual restriction also has been analyzed . In this study, gait of 45 children aged 3-6 years in Shilin and 10 adults were collected at different visual sampling rates. Based on the location of each joint to build a module and Codamotion Three - dimensional action capture system was used to test the Knee joint angle and angular velocity. Finally SPSS statistic software was used to analyze the description and correlation of the data. The result showed the visual sampling rate was positively correlated with angle, angle range, and angular velocity range during walking. The visual sampling rate did not affect the joint angular velocity.