This is a study on the role of phonological encoding, hearing aids and phonemes in deaf students' phonetic identification of Chinese words in lipreading. Some results of the experiment are as follows. The interaction among encoding ways, phonemes, and hearing aids is significant both in acuracy rater and response time. The visibility plays an important role in phonetic identification, while hearing aids have a significant function in the identification of single vowels. The phonological code, and the finger language code, and the mouth moving ...