A field test of the SiVo aid with a profoundly hearingimpaired listener who has a left corner audiogram had been carried out in China. The testing materials are Chinese intelligibility test lists including syllable lists and word lists which are all phonetically balanced. The speech illtelligibility tests were conducted under three different conditions: 1. The listener used the lip-reading only; 2. The listener used the SiVo aid alone; 3. The listener used both lip-reading and SiVo aid. The results show that: 1. The SiVo aid is good for transmitting the pitch contours and for increasing the tone intelligibility of Chinese and manner recognition rate; 2. Lip-reading can contribute to lexical tone perception and the duration information of tonemes may be used by the listener; 3. Polysyllabic words gain higher intelligibility increment than monosyllablic words do by using SiVo aid; 4. Some illterference between the SiVo aid channel and the lip-reading channel at word level maybe exist, and the training of continuous speech is emphasized for Chinese. A field test of the SiVo aid with a profoundly hearingimpaired listener who has a left corner audiogram had been carried out in China. The testing materials are Chinese intelligibility test lists including syllable lists and word lists which are all phonetically balanced. The speech illtelligibility tests were The listener used the SiVo aid alone; 3. The listener used both lip-reading and SiVo aid. The results show that: 1. The The listener used the lip-reading only; is good for transmitting the pitch contours and for increasing the tone intelligibility of Chinese and manner recognition rate; 2. Lip-reading can contribute to lexical tone perception and the duration information of tonemes may be used by the listener; 3. Polysyllabic words gain higher intelligibility increment than monosyllablic words do by using SiVo aid; 4. Some illterference between the SiVo aid channel and the lip-reading channel at word level maybe exist, an d the training of continuous speech is emphasized for Chinese.