Abstract: The nursing season is the key period for the growth and development of animals.The mortality of animal babies is really high during the first month after their birth,so the nursing season is especially important for their survival.By researches on the activity rhythms,time budget and nursing behaviors of endangered species during nursing season,the survival rate of the babies of endangered species can be enhanced,aiming to improve their population.As a companion of the giant panda,the red panda is also a competitive animal to the giant panda in food,in spite of its scarce quantity,gentle temperament,highly ornamental value,the researchers and animal keepers still pay little attention to the lovely species.Thus,studies were made of the time budgets,activity rhythms and nursing behaviors of four female red pandas in Chengdu Research Base of Giant Panda Breeding from 2013 to 2016,by using instantaneous scan sampling and all-occurrence recording methods.It was found that resting was the main activity of red pandas during nursing season,followed by nursing behaviors,exploring,moving,grooming and feeding.The average percent of nursing behaviors during one day was about 20%,except for 01:00~5:00 in the morning; Feeding behaviors occurred more frequently on 19:00~21:00 and 01:00 in the morning.Nursing behaviors had an extremely significant negative correlation to feeding and moving behaviors(P<0.05) and a significant negative correlation to grooming and resting behaviors(P<0.01); Moving behaviors had an extremely significant positive correlation to grooming and feeding behaviors(P<0.05).As for the nursing behaviors,licking the cub occurred the most frequently,reaching up to 70%,and followed by lactating,which was made up to 24%.The results showed the activity rhythms,time budget and nursing behaviors of red pandas,therefore able to have a better understanding of the living habits of red pandas during nursing season,and improve the population of the endangered species.