Aerial photo taken on Dec. 23, 2016 shows the Yanggongdi scenic spot of the West Lake in Hangzhou, capital of east China's Zhejiang Province. Water quality of Zhejiang Province has greatly improved since the provincial government in 2013 proposed a plan of five treatments on water -- sewage treatment, flood control, drainage discharge, guaranteeing water supply and promoting water conservation. (Xinhua/Han Chuanhao)