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In order to study the influence of the distribution characteristics of micro pores in soil on the strength of foamed soil with river sludge, the digital image analysis method was applied on the qualitative and quantitative analysis of the micro pore distribution in the foamed soil with river sludge. The experimental results show that the pore groups with 0.06-0.08 mm and0.20-0.40 mm equivalent aperture are dominant pore groups in foamed soil with river sludge under laboratory condition, the strength of foamed soil with river sludge is closely related to the distribution characteristics of dominant pore groups; the increase of the foam amount will lead to the increase of the number and area proportion of the larger size pore group, the increase of inhomogeneity of pore size distribution, and the decrease of the strength and stiffness of foamed soil with river sludge; the increase of the cement content makes the number and area proportion of the larger size pore group in the foamed soil with river sludge decrease, and the strength and stiffness of foamed soil with river sludge are improved. [ABSTRACT FROM AUTHOR]