Abstract: The weight of main organ of 60 rhesus monkeys were measured and their coefficient were calculated.In the same age, there are no sex difference of organ weight and coefficient in juvenile group,and the weight of heart,spleen,brain, pancreas are heavier in male than female in both adult and senior groups,but the organ coefficient is no sex difference in those two groups. All the organs except for the thymus, the weight are increased with age, especially the heart,liver,spleen, lung, kidney, testis and prostate.Most of the organ coefficient are no age related.

Key words: Rhesus monkey, Organ weight, Organ coefficient