It is expounded the suitability evaluation research in agriculture in three aspects: land suitability, climatic suitability and crop ecological suitability in this paper. The suitability evaluation methods in agriculture are summarized systematically, which including of traditional mathematic model methods (fuzzy comprehensive assessment analysis, AHP etc.) and modern information technologies (GIS, RS and ES etc.). The future development trends of suitability evaluation in agriculture is pointed out that GIS etc. other information technologies and systems can be used and developed for impact assessments of agricultural practices and for studying the effects of land, climate and ecology etc. change.