In certain regions of West Sichuan, the climate and topography is not very conducive to mineralization and decomposition of organic materials in the soil, thus making the soil enriched with organic soil materials and significantly different from mineral soils. 【Objective】In order to study where to put the soils rich in organic soil material in the western part of Sichuan in the soil taxonomy, this study was conducted. 【Method】Six soil profiles featuring such soils were selected in areas as research objects. Forming conditions, morphological characteristics and physicochemical properties of the soils were analyzed to determine diagnostic horizons and diagnostic features of the soils, by referring to the “Keys to Chinese Soil Taxonomy (third Edition)” and then find niches for these soil in the soil taxonomy. 【Result】Results show that the selected soils could be sorted into three soil orders (Histosols, Argosols and Gleyosols), and further into three suborders, four soil groups and six subgroups. According to the “Criteria for Establishment of Soil Family and Soil Series in the Chinese Soil Taxonomy”, the six soils were ruled into six soil families and six series. 【Conclusion】It was found that the soils rich in organic soil material were not necessarily always to be Histosols, while they could be either Argosols or Gleyosols. And Histosols might not necessarily have a Histic epipedon. The Histosols of Buric subgroup were good examples. Compared with the soil genetic classification system, the soil taxonomy could distinguish more accurately soil types from each other in the same area under similar bioclimatic conditions.