Abstract: 【Objective】Soils in the surface layer(0-20 cm)were collected to determine soil micro-aggregate features and soil physical and chemical properties when chickens were raised in different densities(0, 600, 1 200, and 2 400 chickens per hm²). The proportion of characteristic soil micro-aggregates(PCM, <0.02 mm/(≥0.02-0.25 mm))and the ratio of soil micro-aggregates diameter(RMD, <0.02 mm/(≥0.02-2.00 mm))and the factal dimension(D)were calculated. The relationships of soil physical and chemical properties with these indices were evaluated. 【Method】Citrus orchards in a low hill area of Sichuan Basin were taken as objects and four 20 m×20 m sample plots were created, with three replicates each, and chickens were raised in each plot at one of four densities(0, 600, 1 200, or 2 400 chickens per hectare). The S type of the five-point sampling method was used for stratification and sampling of the soil(0-20 cm). The soil micro-aggregate composition, the contents of organic matter, total nitrogen, hydrolyzed nitrogen, total phosphorus, available phosphorus, total potassium, available potassium, and soil physical properties were measured. 【Result】 The results show that raising chickens in citrus orchards increases large particle(≥0.02-2.00 mm)content and decreases small particle(<0.02 mm)content in soil micro-aggregates. Moreover, PCM, RMD and D presented a decreasing trend as the density of chickens increased. PCM, RMD and D had significantly negative correlation(P<0.05)with soil water content, non-capillary porosity, capillary porosity, total porosity, ventilation degree, organic matter, total nitrogen, hydrolyzed nitrogen, total phosphorus, available phosphorus, total potassium, and available potassium while had significantly positive correlation with soil density. 【Conclusion】 These findings indicate that raising chickens in citrus orchards is beneficial for promoting transformation from smaller soil micro-aggregates to larger micro-aggregates and could improve soil micro-aggregate composition, while decreasing PCM, RMD, and D. PCM, RMD and D can be used as important comprehensive quantitative indices to evaluate soil physical and chemical properties when raising chickens in a forest ecosystem.