Abstract: The present paper carries on investigation in the respiratory system of three golden monkeys-Rhinopithecus roxellanae, R. bieti and R. brelichi. The chief morphological difference among them basing on the data of the gross dissection, are as follows.1. It is worthy to note that none of the accessory air sinuses is developed, but there is a bulla ethmoidalis in bieti (1♀. ad.).2. fncisura i nterary taenoidea of bieti is not observable but it is very markable in roxellanae and brelichi.3. There is a cranial median incisure of epiglottis cartilage in brelichi, but absent in roxellanae and bieti.4. On the arytenoid cartilage muscular process is very sharp and the vocal process is oviform in bieti, which are contrary in brelichi, and intermediate in roxellanae.5. The corniculate cartilage ot both bieti and brelichi is fan-shaped but bar-sh-ap o d in roxellanae.6. The right lung of brelichi has six lobes. The lower lobe is subdivided into an upper part and a lowcr one, so that the lobes of the right lung are: ( a ) superior, ( b ) middle, ( c ) superior lower, (d) inferior lower, ( e ) azygos and ( f ) the a ccessory lobe. There are five lobes in bieti of which the lower lobe is not subdivided, four lobes in roxellanae of which the accessory lobe is lacking.7. The azygos lobes of bieti and brelichi are entirely separated from the middle lobes, but are not entirely separated in roxellanae.8. The right infrapericardic bursae arc existing in bieti and brelichi, while the left inf rapericardic bursae arc only seen in the roxellanae, without the right one.