Xi 'an is located in the south-central part of Guanzhong Plain in Shaanxi Province, China. Except the Qinling Mountains in the south, the main landforms are the Weihe Plain and the Loess Plateau in Guanzhong. The altitude of Xi 'an varies according to its geographical location, ranging from 400 meters to 690 meters. Xi 'an has a temperate monsoon climate with four distinct seasons, with an average annual temperature of 65,438 03.3 degrees Celsius and an average annual precipitation of 604.2 millimeters ... This climatic condition is relatively beneficial to crop growth and people's life.