The emergence and spread of the variant form of Chinese Character are related to people’s cognitive principles. The cognitive modes of Chinese Character formed by identity, assimilation, distinction and integration. On the surface, the variant form of Chinese Character appears haphazardly. It is clearly seen that there are the reason on the evolution of the variant form of the Chinese Character, which mainly lies in the active role of human perception. People’s cognitive principles determine not only the ways of the emergence but the degree of variation of the variant form of Chinese Character.