Xi'an is one of the four major ancient civilization capitals, locating in the center of Guanzhong Plain.

The regularities of the regional varieties of the crop ecologic factors and characteristics of the agricultural production in the Guan Zhong Plain are analyzed in this paper.

It is an area of 800 square km in Shaanxi province that boarded with Wei River to the south and chain of Bei Mountain to the north.

The province is divided into three natural regions: Northern Shaanxi Plateau, Guanzhong Plain and Hanzhong Basin.

There are Guanzhong plain known as "800 li Qinchuan" and the Loess Plateau and mountain Qinba which has important ecological functions in Shaanxi Province.