China Geological Survey has energetically carried out multi-objective regional geochemical investigation in recent years and, as a result, disclosed large quantities of microphenomena which were not understood in the past. The research and evaluation of ecological environment seem to be the major problem facing us. This paper has put forward and probed into the problem of ecological geochemistry and its evaluation, which includes the definition, train of thought for research, technical line, eco-geochemical evaluation and global, regional and local eco-geochemical evaluation.