Trough analyzing 24 Japanese learners’ conversation material of Hunan University in the previous five semesters, we found that the utilization frequency of NE is no more than half of the native speakers. The functions’development sequence includes four steps. On the language forms, NE initially appears at the end of a sentence; then, freely using at the other positions of a sentence. Moreover, the usage of「そうですね」is extremely frequent. The usage of NE is also affected by the input of teaching. By observing that three aspects of NE, this study indicated that NE is firstly used in the initial stage but the acquisition process is slow. To the learners, there are obvious individual discrepancy in the usage of NE.