Art education devotes to childrens' successful 'Total education'. Also through Art education childrens' cognitivity can be developed. In this study, Art educational curriculum especially in clay art is studied for development of childrens' cognitivity. Nowadays, comparing to the past, definition of cognitivity is used in broad way. Various aspects of the cognitivity are correlated each other. Jean Piaget insists the importace of the childrens' accomodation and assimilation for cognitivity. There are scholars insist on the informational strategic approach in cognitive study. They see the cognitive development is similar to the gathering of informations in the computer. Scholars who stand for the new piaget theory insist on combining the theory of Piaget and informational strategic approach. They assume that the childrens' cognitive changes are related with the childrens' abilities of solving problems. Scholars who insists that children are in the social context think childrens' cognitivity is related with their social environments. Childrens' cognitivity also develops when they grow. Infants can have their visual and haptic cognitivity at the same time. These cognitivity seems toe come from nature. In the early childhood children think according to the surfacific facts, older children think according to the assumptions which is related with the basic order. As childrens' cognitivity comes from the inducive reasoning, adolescents' cogrutivity is come from the deductive reasoning. During childrens' Art activity, accomodation and assimilation are repeated. Children accept new aspects and try to unify with already accepted concepts. When children usc art materials they recognize that their thoughts are visualizing. Victor Lowenfeld thoughts that childrens' repetition of the schema mean the searching for the order with the childrens' self confidence. Through studies of Lowenfeld and Golomb, it was proved that childrens' cognitive development can be stimulated by clay art. Clay which has plasticity more than any other ali material,' is one of the best material for the childrens' free expression. I hope that not only clay art curriculums in this study can be used for childrens' cognitive development but also used in unifying education, total education and other specific fields.