The file photo taken in June 2005 shows herdsmen dance on the Qiangtang Grassland in Tibet Autonomous Region, southwest China. Qiangtang Grassland is surrounded by Kunlun Mountains, Dangla (Tanggula) Mountains and Kangdese Mountains. Its length from the east to the west is about 1,200 kilometers and the length from the north to the south is about 700 kilometers. The average latitude is above 4,500 meters. The Qinghai-Tibet railway which will begin its trial operation on June 1, runs across the Qiangtang Grassland.  [Xinhua Photo]

The file photo taken in August 2005 shows cattle on the Qiangtang Grassland in Tibet Autonomous Region, southwest China. [Xinhua Photo]

The file photo taken on August 1, 2005 shows a couple and their child walking past their tent on the Qiangtang Grassland in Tibet Autonomous Region, southwest China. [Xinhua Photo]

The file photo taken on August 1, 2005 shows that a Tibetan leads a horse on which his lover sits, and prepares to give a performance during the horse race festival on the Qiangtang Grassland in Tibet Autonomous Region, southwest China. [Xinhua Photo]

The photo taken on June 14, 2006 shows the Buddhist pagodas in memory of eight heroes of King Gesser, which is a lengedary Tibetan hero, on the Qiangtang Grassland in Tibet Autonomous Region, southwest China. [Xinhua Photo]