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本文着重探讨地理信息系统PCARC/INFO在农用土地分等定级研究中的方法和过程，将ARC/INFO与关系数据库系统（FDXBASE）集成一体，实现地理空间数据和土地属性数据的自动连接，以及农地分等定级信息的快速查询与检索。以土系作为评价单元，通过分析，定量地反映了研究区土地的质量状况。
This paper focuses on the method and process of PCARC / INFO in the classification and grading of agricultural land. It integrates ARC / INFO with the relational database system (FDXBASE) to realize the automatic connection of geospatial data and land attribute data, and Quick Search and Retrieval of Agricultural Land Classification and Grading Information. With soil system as the evaluation unit, the quality status of the land in the study area is quantitatively reflected through the analysis.