Through soil column leaching experiments, migration of antimony in red and brown calcareous soil, typical to South China was studied. Samples were collected from the columns at the end of the experiment for analysis of proportions of varieus fractions of Sb(V) different in binding form using the sequential extraction method, based on which impacts of redox potential on migration of antimony, and of pH on migration of antimony in iron-coated quartz sands. The experimental results show that the migration of antimony in the brown calcareous soil had a higher peak value (C/C₀ = 0.88) on its penetration curve than that in the red soil (C/C₀= 0.26), and the effluence of antimony was observed earlier in the former than in the latter. In the red soil, "hangover" of the penetration curve was quite apparent. Things went just reversely with the second leaching effluence. The peak value of the penetration curve increased significantly with C/C₀ reaching up to 0.58 in the red soil, but decreased significantly in the brown calcareous soil as compared with the first leaching and C/C₀ reduced to 0.70, which indicates that the first leaching was imcomplete in the red soil and fairly thorough in the brown calcareous soil. The sequential extraction experiment reveals in the acid red soil antimony exists mainly in the form fairly strong in binding energy and stable chemically, so it takes a longer time for antimony to get through the soil column and the process of penetration is not so clear. In the brown calcareous soil, antimony exists quite similarly to its presence in the red soil in form and distribution pattern, but the proportion of weakly bonded forms of antimony (non-specifically adsorbed and specifically adsorbed forms) is higher than that in the red soil, which indicates that its adsorption is somewhat reversible, and may also explain why Sb in the brown calcareous soil needs less time to penetrate with a higher penetration peak. Soil pH has some effect on migration of antimony in iron-coated quartz sands. When pH was 4, antimony penetrated iron-coasted quartz sands displaying a nice symmetric penetration curve, without much hangover. With rising pH, symmetry of the curve was disturbed and the phenomenon of hangover became obvious. Based on the experiments it could be concluded that the antimony in the red soil is quite lower in mobility than that in the brown calcareous soil as is shown in the first leaching experiment, and the mobility improves in the red soil when leaching lasts long enough as is indicated in the second leaching experiment. Through the soil column extraction experiment, it is found that the antimony in the soils exists mainly in iron and aluminum oxides-complexed form, and a limited proportion in non-specifically adsorbed, specifically adsorbed or residue form, while the antimony content in brown calcareous soil consists more of weakly bonded forms, and that soil pH has some obvious effect on migration of antimony in iron-coated quartz sands and with rising pH, antimony weakens in mobility in the quartz sands.