This essay focus on the phase of form on the respect of writing by reviewing a series of argument about the form of Hyangga. It is a conclusion of those arguments that Hyangga has the three unit of meaning. This conclusion is directly associated with ‘Samgu-Yukmyung’[3句6名]. It is not only the form of Hyangga but also the principle of composition. The fact that the 1st unit and 2nd unit is bound in the form of correspondence especially has attracted considerable attention. For example, ‘past-presence’ and ‘world-self’ is the representative relation. This form has emerged in different Korean poetry and the other genre. Therefore the form of correspondence seems to be the fundamental mechanism of perception and conception. The separation of form and contents is ordinary in the field of writing education. But the form of correspondence suggests the possibility of their unity. And because the form of correspondence is fundamental and universal in Korean writings, the acquaintance with that form is a way of development of cultual literacy.