Abstract: 13 adult Rhinopithecus,includes R.bieti and R.brelichi were analysed on the long bone and skeletal allometry.Somethings about limbs,skeletal trunk length (STL) and predicted body weight are dealed,From the results,we can see that the length of the forelimb increases faster than that of hindlimb,during the mature this adapte to climbing on the vertical supports.Reduction of both limbs serves to move the animals climbing center closer to the support,and this is correlated with the higher intermembral index.Considering the STL,humerus,radius,femur and tibia,Rhinopithecus is closer to Theropithecus,Papio,Presbytis,Macaca and Nasalis.So we hypothesis that Rhinopithecus live on the ground for most of the time.But for the eating,resting and escaping the danger in the trees.Brachiation,suspension rarely happen to them.