|（1.School of Physical Education，Soochow University，Suzhou 215021，China；2.Group of Physical Education，Suzhou Foreign Language School，Suzhou 215011，China)
Abstract: Based on foot arch height index, the authors selected 9 high arch foot students as the experiment group and 9 normal foot students as the control group, and used a KISTLER 3D force measuring platform to analyze the mechanical control characteristics of running of the two groups of testees at the supporting stage. Research results: 1) in the vertical direction, at landing, the peak vertical force and the first loading rate produced by the high arch foot testees are significantly greater than those produced by the normal foot testees (P<0.05); the differences in the peak driving force and the second loading rate as well as the time to peak between the two groups have no statistical significance (P>0.05); 2) ) in the anteroposterior direction, the peak accelerating force produced by the high arch foot testees is greater than that produced by the normal foot testees (P<0.05), the differences in other indexes be-tween the two groups have no statistical significance (P>0.05); 3) in the medial-lateral direction, the maximum value, minimum value and fluctuation range of the force produced by the high arch foot testees during running are greater than those produced by the normal foot testees (P<0.05), the differences in other indexes between the two groups have no statistical significance (P>0.05). The results indicate the following: 1) the high arch foot testees suf-fered a greater (peak) impact force and loading rate, and their stiff foot arch may hint that the decrease of their foot arch’s ability to absorb shocks at landing is one of the important causes for high arch foot injury; 2) the differences in the anteroposterior and medial-lateral directions between the high arch foot testees and the normal foot testees are probably one of the potential factors for causing high arch foot injury, these differences are probably related to foot arch stiffness, poor lower limb muscle activity and muscle work difference. In conclusion, high arch foot people’s ability to maintain kinetic control at the supporting stage during running is relatively poor, which reflects the differ-ences in the mechanical control mechanism between high arch foot people and normal foot people during running.
Key words: sports biomechanics；high arch foot；supporting stage；loading rate