The morphology of zircon can be divided into three independent parts: prism habit consisting of 100 and 110, pyramid habit consisting of 211 and 101, and elongation habit consisting of prism and pyramid. Hence, prism index, pyramid index and elongation index are presented in order to describe the morphology of zircon quantitatively. Because these indexes can be used not only for describing the external morphology of zircon, but also for revealing the morphological evolution throughout the history of zircon growth, the theory of crystal growth dynamics can be applied to studying the typomorphism of zircon by means of this method.