Abstract: The Growth of teeth among 44 rhesus monkeys under domesticated condition were observed and briefly reported in this paper.According to other data, the authors discussed the tooth patterns in correlation with age and ontogeny.They pointed out that in regard to tooth pattern or tooth sequence, the breeding age of male rhesus monkeys oughtnot earlier than the early stage of tooth pattern and for (2·1·2·2)/(2·1·2·3) the female,not earlier than the early stage of tooth pattern (2·1·2·2)/(2·1·2·2).