From the practical need of scientific research, the authors put forward the concept of "eco-geochemical reference field". On the basis of this concept, this paper has discussed the concept and meaning of the soil eco-geochemical reference value. With the experimental result of the Zhangzhou study area as an example, the relevant relationship method was used to define the soil eco-geochemical reference value, which has provided a train of thought or a reference case for other relevant research work.