In this work, the characteristics of organic matter in different particle fractions of albic soil were studied by using Kumada's method. The results showed that the contnet of orc C in fertile soils and their particle fractions was higher than that in poor soil and it decreased with the increase of particle diameter. The decrement was smaller in fertile soil than that in poor soil. Soil organic matter and clay content the consistency between the storage curve of organic C and the content curve of particle fractions. Organic C storage of clay or fine sand particles in fertile soil was significantly higher than that in poor soil. The humus in soils and their particle fractions were mainly free form which can be extracted by 0.1 mol/L NaOH.Some indexes such as humic acid content and the PQ value of free form were higher in fertile soil than those in poor soil. But the degree of humification based on ΔlogK and RF values was lower in fertile soil.than that in poor soil. Those trends were much clear for silt and fine sand particles. With the increase of particle diameter, the contents of free humus and its humic acid. tended to decline, but the PQ₁ value was higher in silt particle than that in other particle fractions. The type of free humic acid changed with the increase of particle diameter in the order of A type (clay)→B type(silt)→Rp (fine sand). The content of combined humus which was extracted by 0.1 mol/L Na₄P₂O₇ and its humic acid content and the degree the humification were the highest in the silt particle, but PQ₂ decreased with the increase of particle diameter. Both in fertile soil and in poor soil combined humic acid mainly belonged to A type in which the degree of humification was higher, only a few belonged to B type or P type.