Summer tempreture keeps around 21 degree average at Shangri-la of Diqing highland,Yunnan province.It is one of the best cities to escape summer heat.After few raining days ,the Napa lake,a wetland ecological protection area,becomes a wonderful place to enjoy leisure time with families and friends.Let's see the best summer time at Napa lake by the video.(video by Wangwei,He jingyun)