Photo taken on June 23, 2015 shows the Panda Hospital in Dujiangyan Base of CCRCGP. It was built in the style of western Sichuan dwellings. Photo: Xinhua/CRI

Photo taken on June 24, 2015 shows a 25-year-old panda named Zi Xia who is blind in his right eye. He will spend his rest life in Dujiangyan Base of CCRCGP. Photo: Xinhua/CRI

Photo taken on June 24, 2015 shows a 25-year-old panda named Zi Xia who is blind in his right eye. He is given medical care in Dujiangyan Base of CCRCGP. Photo: Xinhua/CRI

Photo taken on June 24, 2015 shows a 26-year-old panda named Zi Yun who lost one hind leg. He was rescued in the wild and given medical care in Dujiangyan Base of CCRCGP. Photo: Xinhua/CRI

Photo taken on June 24, 2015 shows a 30-year-old male panda named Panpan, who is the oldest one living in Dujiangyan Base of CCRCGP. 17% of the world's pandas in captivity are its descendants in the past 20 years. Photo: Xinhua/CRI

Photo taken on June 23, 2015 shows Deng Linhua, director of Panda Hospital in Dujiangyan Base of CCRCGP. There are nine panda doctors in the hospital. Photo: Xinhua/CRI

Photo taken on June 23, 2015 shows pandas' "afternoon tea" including steamed corn-bread, carrots, apples and milk. Photo: Xinhua/CRI

Photo taken on June 23, 2015 shows a panda's house made of black bricks and grey tiles in Dujiangyan Base of CCRCGP. Photo: Xinhua/CRI

Photo taken on June 23, 2015 shows a simulated operation room for pandas in the public education area of Dujiangyan Base of CCRCGP. Visitors can play a doctor to cure the simulated injured or sick panda. Photo: Xinhua/CRI