Incubation and pot experiments were conducted to study the effects of organic materials (grass charcoal, pig manure and earthworm manure) on the amelioration of Cd-polluted soil. The experiment was performed under three water conditions, i.e. submerged, field capacity and 65% relative water content. The results showed that the content of soil exchangeable Cd decreased significantly and FeMnb-Cd, Ob-Cd contents increased after adding organic materials under different water conditions. The effect increased with the increase of soil moisture, i.e. submerged＞field capacity＞65% relative water content. The effects of organic materials on the availability of Cd were different, with an order of earthworm manure＞pig manure＞grass charcoal. The growth state of rape in soil at submerged state was better than other water conditions. Some differences of growth indexes of rape were not significant between field capacity and 65% relative water content. The effects of organic materials on the growth of rape were also different, with an order of earthworm manure＞grass charcoal ＞CK＞pig manure.