Diversity indices and abundance distribution models are statistical tools which ecologists have applied for decades for analyzing the intrinsic regularities of various ecological entities. In this work, similar techniques are used to analyze geomorphic diversity (as an example of geodiversity in a broad sense), and discussions are conducted on the basis of the SOTER digital databases of Hainan Island, China. Through calculation of indices of richness (S), indices of diversity (H') and indices of evenness (E) of landform categories of soil parent materials, and establishment and application of the model of multi distribu tion of landform categories of different soil parent materials, the analysis of geomorphic diversity of different soil parent materials in Hainan in the GIS environment can be expressed digitally.