This paper starts with an introduction of the characteristics of Qing Dynasty painting,and mainly appreciates and analyses Cheng Zhengkui s painting style and techniques,especially his masterpiece A Horizontal View of the Country,as well as another painting preserved in Gansu Provincial Library.

Correlation between delayed cool injury in the lower reaches of Tumen River and El Nino(La Nina);

Study on low-frequency oscillation characteristics for temperature and precipitation in the lower reaches of Tumen River;

Characteristics and change of landscape in lower reaches of Tumen River;

From his coterie of collectors and friends in Hangzhou, especially Jiangshan Xueji Tu (Rivers and Mountains after Snow) collected by Feng Mengzhen, and Wangchuan Tu (Wang-ch\'uan Villa) traced by Guo Zhongshu and collected by Gao Lian, decisively impacted Dong\'s view of Wang Wei, which further leads to the cornerstone of his theory of Southern and Northern school.