In order to evaluate the heavy metal background distribution and pollution level of major grain cultivation(rice) area in Ningxia, the study collected soil from basic farmland soil in Ningxia. The content of heavy metal(lead,arsenic,cadmium,mercury) in soil were detected and analysed through Atomic spectrophotometry. At the same time,the content of heavy metal of total soil,soil from different administrative region and soil of different geomorphic units were compared and analysed the differences.The polluti...