The scientific essence of geoherbs bases on the attribute of matter. The phenotype of geoherbs from biological point view includes medicinal character, tissue structure, content and composition of the effective components and the therapeutic effect. The forming of geoherb is resulted from the interaction of genotype and environment. It can be expressed by the formula: phenotype = genotype + environmental modification. In order to prove this hypothesis, the authors discussed the model organism and model for geoherbs' study based on Salvia miltiorrhiza.