Samples were collected from anthropogenic forest soil and cultivated soil at Bailuyuan site to observe and quantitatively analyze their micromorphological features with the aid of a polarizing microscope and the Qwin software.Results show that the two soils are quite similar in mineral composition.Their coarse granules are mainly formed of quartz and feldspar,but some-what different in size and shape of particles.The anthropogenic forest soil is characterized by smooth pores,packed voids and continuity in succession of micromorphology,whereas the cultivated soil by intricate rough pores and obvious changes in succession of micromorphology with depth of the profile,particularly at 20 cm and 35 cm in depth.The existence of a large amount of cryptocrystal calcite suggests that the soil environment has been subjected to frequent changes,of acicular calcite in the mid and lower part of the plow pan that the soil environment has undergone a short stable period,and of microlitic calcite that the soil environment has been maintained stable for quite a long period.