Country to Zhou’s (1978) claim, the phonetic representation function is found for semi-homophonous radical characters that share the same initial consonant or the same rhyme with their phonetic. Moreover, the phonetic representation functions for agreements in individual segmental features are additive in determining the phonetic representation function fro an agreement in syllables. Thus the observed regularity effect is partly due to the same initial consonant and partly due to the same rhyme shared by low frequency characters and their phonetic. Although overlooked in the literature, the phonetic representation function is also found for the supra-segmental feature tone. It is interesting to note that the phonetic representation function for the supra-segmental feature exists generally over and above the phonetic representation function for syllables, although the supra-segmental feature produces interference effect in the different-syllable condition for low frequency characters.