Abstract: In order to further expand the depth and breadth of the investigation of agricultural remote sensing resources,Hulunbuir City and Xing'an League of Inner Mongolia as an example were taken to study the method of“3S”technique to map the spatial distribution of main crops.The steps of using the LandSat8 satellite remote sensing image to extract the crop information were introduced and the drawing results were evaluated accurately in the paper,which provides effective data for the layout of agricultural resources in Hulunbuir City and Xing’an League.