Abstract: Land cover classification data is an important part of the geographical conditions survey Data. Combining with the characteristics of the project area and basic data, the content of land cover classification data, collecting basic principles and the image interpretation, etc., this paper, taken Dianjiang district in Chongqing as an example, analyzed and concluded the issues in the process of data acquisition in detail, solved the problems should be paid attention to in the indoor interpretation and the procedures needing follow and Matters needing attention on the field investigation and sample build process, in order to better ensure the quality of achievements, and provide some help for the geographical conditions survey work.