Japanese word types could be divided into four kinds, which are: Japanese inherent word, early Chinese loanword, modern foreign loanword and hybrid word. Among them, Wago, i.e. the Japanese inherent word mentioned above, is the most common kind in daily conversation. From the viewpoint of phonetic, Wago has two types of accent, namely "zero accent" and "-3 accent". Such accent tendencies are often found in Wago nouns with four-mora. In the teaching scene, if such an accent rule can be applied, it can not only reduce the burden on learners to remember accent, but also improve their ability to perceive accent and production ability, so that the pitch of Japanese words could be more correct and the learners’ pronunciation would be more fluent.