Abstract: The different characteristics of 56 musculi in Rhinopithecus were dealt with for comparative research. There are some differences betwecn the muscular systemis of three species of snub-nosed monkey. The major features of the myology of these animals, except that of anthropoid and human, share with Cercopithecoidea. In Ceropithecoidea, the muscular system of Rhinopithecus is more similar to that of leaf monkey than that of other species and some characteristics of them are more advanced than that of other monkeys. In the sense of the evolution, the myology characteristics of golden monkey are between leaf monkey and apes, so these species are relatively more advanced than other species of Cercopithecoidea. The conclusions are summarized below.
1. Though some of the characteristics of muscular system in three species of Rhinopithecus are mostly homologous, there are also some differences among them.
2. According to our observations, the results slightly differ from that found by Patterson (1942) in R. roxellanae. It is possibly diffferent in animals themselves. But some results of patterson's obviously belong to noting mistakes, because these results gained by us from three species of Rhinopithecus are all identical.
3. Most of the myology characteristics are similar to that of other species in Cercopithecoidea, but some of the features resemble that of ape and human being and differ from other monkeys. It indicates that Rhinopithecus is more advanced than other animals of Cercopithecoidea.
4. The myology characteristics of Rhinopithecus are mainly similar to those of leaf monkey and some of them show much more development than those of leaf monkey. If leaf monkey occupies intermediate position between Old World monkeys and gibbon in the phylogeny as it was shown by Ayer (1948) in Semnopithecus entellus, we consider that in terms of the myology characteristics, Rhinopithecus must occupy the position between leaf monkey and gibbon.

Key words: Snub-nosed monkey(Rhinopithecus); Myology characteristics