Ningxia Plain is located between Ningxia Hui Autonomous Region, Helan Mountain and Ordos Plateau, also known as Yinchuan Plain. It starts from Shizuishan in the north, reaches the Loess Plateau in the south, the Ordos Plateau in the east and Helan Mountain in the west. The length from north to south is about 280km, and the width from east to west is 10 ~ 50 km, with an area of about 7800km2. The terrain is high in the south and low in the north, with an average elevation of1100 ~1200m. Geologically, it belongs to the fault depression area and the Yellow River alluvial plain. Irrigation agriculture in the plain is developed, and there are many irrigation channels with a long history, such as Qinqu, Hanqu and Tanglaiqu, which are known as "Jiangnan".