本研究透過日語母語話者的聽取實驗，來探討台灣人日語學習者的促音語及非促音語的發音問題。此外，為了闡明甚麼樣的發音錯誤，會影響促音發音評價的結果，由日語母語話者對40名的台灣人初級日語學習者所發的20語語音進行發音評價。結果發現：（1）在促音語中，促音脫落的問題對發音評價的結果有決定性的影響。此外，語尾拍過長、無聲破裂音的有聲化、單音錯誤也影響評價結果。（2）在非促音語共400語中，促音添加的問題就估了146語，對發音評價產生很大的影響。（3）比起破裂音的清濁問題，拍長的適當與否顯然更影響促音發音評價的結果。

This research is to study geminate or non-geminate words spoken by Taiwanese Japanese Learners for clarifying pronunciation errors according to native speaker's perceptual experiment. To understand what types of pronunciation error the learner makes affect the pronunciation evaluation, 20 words spoken by each 40 Taiwanese beginner learner were evaluated. The results could be summarized in the following three points: (1) In geminate word, geminate- dropping had a decisive influence on the evaluation. Also, mora duration of the final vowel, error in voiceless plosive consonant, and mistaken pronunciation affected the evaluation. (2) In non-geminate word, 146 out of 400 words had error of geminateinserting which showed that error of geminate- inserting affected the evaluation. (3) Compared to error in voiceless plosive consonant, the mora duration had a more significant influence in native speakers' evaluation.