| 摘 要： | In this article, on the basis of the characteristics of the moire contour fringes of Nycticebus coucany, Macaca assamensis M'clelland, Presbytis phayrei, Phinopithecus roxellanae, Hylobates concolor leucogenys, Gorilla gorilla. Anthropopithecus troglodytes. Simia satyrus and modern human beings we divide the Primates into two types. The two types of the new classification may be two groups of the evolution moving state.For comparison with each other, the angle γ between the approximately elliptical major axis of the moiré contour fringes on the medial condyle and the horizontal plane is taken as the criterion. We suggest that the Primates evolution to the state of erect walking is the process of the angle γ evolution approaching 90°, regarding the γ of the moire contour fringes of the medial condyle as the evolution angle on the knees of the Primates.
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