Based on a systematic summary of research results available on typomorphic characteristics of zircon crystal form, this paper makes an approach to crystal growth mechanism of typomorphic characteristics of zircon with the help of theories of crystal growth, crystal chemistry and geochemistry. The results show that there exist differences in composition and proportions of atoms, links, power of chemical bonds, intervals and densities of crystal lattice faces in different directions of its crystal structure. These differences affect growth velocity of crystal lattice faces in different directions and control corresponding crystal forms under different conditions of crystalline media. For example, alkaline elements can affect diffusion velocity of Zr, Si and O ions although these alkaline elements cannot exist in crystal structure of zircon. However, K rich media and Na rich media exert different effects on the growth of crystal form: in the K rich media, growth speed of prism faces in the vertical direction is much higher than that of pyramid faces, and {111} growth speed in the vertical direction is higher than {311},which decides the formation of bipyramids dominated by {311} pyramids; in the Na rich media, both prism and pyramid grow to a certain extent, but the former is smaller than the latter. {100} growth speed in the vertical direction is lower than {110}, while {111} growth velocity in the vertical diredtion is lower than that of {311},resulting in the growth of the crystal form characterized by {100} short prism and {111} pyramid. With similar research method, this paper has proved the objective nature of the typomorphic characteristics of zircon, brought to light the internal and innate relations among typomorphic characteristics of zircon, and opened up the prospects of applying these characteristics to granite study, thus providing more analytical and applying value to single zircon grain geochronometry.