Photo shows autumn scenery in Qilian Mountains, northwest China's Gansu Province. Extending more than 1,000 kilometers, Qilian Mountains cover the mountain range on the border of Qinghai and Gansu Provinces in northwest China. (Xinhua photo)

Photo shows autumn scenery in Qilian Mountains, northwest China's Gansu Province. Extending more than 1,000 kilometers, Qilian Mountains cover the mountain range on the border of Qinghai and Gansu Provinces in northwest China. (Xinhua photo)

Photo shows autumn scenery in Qilian Mountains, northwest China's Gansu Province. Extending more than 1,000 kilometers, Qilian Mountains cover the mountain range on the border of Qinghai and Gansu Provinces in northwest China. (Xinhua photo)

Photo shows autumn scenery in Qilian Mountains, northwest China's Gansu Province. Extending more than 1,000 kilometers, Qilian Mountains cover the mountain range on the border of Qinghai and Gansu Provinces in northwest China. (Xinhua photo)