Abstract: 【Objective】In order to further improve and consolidate in Arun Banner of Inner Mongolia.【Methods】Nutrient status of cultivated land of 12 towns,farms and forest farms in Arun Banner were investigated in 2017.【Results】According to the 2017 Arun Banner arable land quality grade evaluation standard,the average soil organic matter content of the entire banner arable land is 51.14 g/kg,which belongs to the level 1 （high）;the total nitrogen content is 2.43 g/kg,which belongs to the level 2 （higher）;available phosphorus was 44.01 mg/kg and available potassium content was 255.29 mg/kg,all of which belong to the level 1 （high） . The soil nutrient content of cultivated land in Arun Banner varies greatly,and the coefficient of variation of each nutrient index ranges from 17.63% to 37.76%. Among them,the coefficient of variation of soil organic matter content is the smallest,and the coefficient of variation of available phosphorus is the largest. From 1982 to 2006,the results of four surveys at the same site showed that the organic matter,the total nitrogen and available potassium of the cultivated soil （0-20 cm） decreased significantly,and the content of available phosphorus increased.【Conclusion】Through the investigation and quality evaluation of cultivated land,it provides an important scientific basis for strengthening the quality protection and construction of cultivated land,and improving the utilization of soil and scientific fertilization.

Key words: Arun Banner, Cultivated soil, Nutrient status