It had never occurred to me to wonder how Braille worked in Chinese, but now I know:
Chinese braille is based on a phonetic representation of the sounds of the language. There are no braille signs for individual Chinese inkprint characters, only for sounds…. As with all other braille codes, Chinese braille is read from left to right – whatever the direction of any inkprint original.
As a rule, in the inkprint one syllable is represented by one character. The same syllable in braille is written with one, two or three signs. There are three categories of these braille signs.
* initials: the consonants that are only found at the beginning of a syllable.
* finals: vowels (n, ng and r at the end of a syllable are not really consonants)
* tones: signs that indicate the tone of the word
There are tables of signs and a couple of examples with characters for comparison. (Via Brainysmurf.)