关键词: 大熊猫, 繁殖, 繁殖率

Abstract: This paper reports the reproduction of the giant pandas at Wuyipeng Study Areas，Wolong Natural Reserve from 1978 to 1992．The results showed that wild female pandas came to estrus at the age of 6.5 years and gave birth at 7.5 years，stopped giving birth about 20 years．Wild male pandas came to estrus at 7.5 years and mated with female at age of 8.5 years,stopped mating still about 20 years.The annual reproductive rate of giant pandas was 62.5%，including 58.33% for the single fetus and 4.17% for the twin fetus.Since 86.4% of Bashania fangiana flowered and died off in 1983，so the estrus time of pandas had to be delayed almost one month in each year after 1983．The reason is perhaps that pandas got less trace element-Mn fron Bashania fangiana after flowering．

Key words: Giant panda, Reproduction, Reproductive rate