Fate and behavior of polycyclic aromatic hydrocarbons (PAHs) in soil environment are mainly controlled by their interactions with different soil components. Generally, the content and structure characteristics of organic matter and mineral composition in different soil particle-size separates are different. Hence, the environmental fate of organic pollutants affected by different soil particle-size separates is different. In this paper, two different type soils, paddy soil (SEBC-07) and red soil (SEBC-13) were separated into different particle-size separates (<2 μm、2~20 μm、20~54 μm、54~105 μm、105~280 μm、>280 μm) by physical method, and the sorption and desorption of phenanthrene by them were studied. The rankings of the sorption capacities (Kf) of phenanthrene by different particle-size separates of SEBC-07 and SEBC-13 were 2~20 μm > 20~54 μm > 54~105 μm > < 2 μm > > 105 μm and 20~54 μm > < 2 μm > 2~20 μm > 54~105 μm > 105~280 μm > >280 μm, respectively. The sorption capacities of all the particle-size separates of the paddy soil with high organic matter content were significantly greater than those of in the red soil with low organic matter content, except < 2 μm and 20~54 μm separates. In both soils, K_oc values of 20~54 μm separates were greatest, and then decreased with increasing or decreasing particle-size. The values of K_f and K_oc of different particle-size separates of two soils had no significant correlation with their physio-chemical properties (e.g. organic content and specific surface area). Desorption hysteresis were observed of different particle-size separates of both soils.