The effects of Chinese milk vetch and rice straw on the availability and the forms of Cd were studied in order to afford the theoretical support for the remediation of heavy metal-contaminated paddy soil by the decomposition of Chinese milk vetch and rice straw.An in-lab experiment was conducted with five treatments including with control (CK)，the incorporation of rice straw only (R2G0)，the incorporation of Chinese milk vetch and rice straw with the mass ratio 3∶1 (R3G1)，the incorporation of Chinese milk vetch and rice straw with the mass ratio 1∶1 (R1G1)，and the incorporation of Chinese milk vetch only (R0G2).The available Cd was decreased with the increase of the mass ratio of Chinese milk vetch and the available Cd of R0G2 was significantly reduced by 34.41%，compared with that of R2G0.Both of the residual Cd content of R0G2 and R2G0 were higher than that of R3G1 and R1G1 and the residual Cd of R0G2 was higher than other treatments by 20.00%～51.90%.There were significantly negative correlations between DON，pH and the available Cd and the acid-soluble fraction of Cd，while significantly positive correlations was existed between organic matter and the available and the acid-soluble fraction of Cd.The amount of explanations of DON，organic matter and pH for the availability and the forms of Cd were 64.6%，17.2% and 4.1%，respectively.There were better effects of the addition of Chinese milk vetch on the stability of Cd.The addition of Chinese milk vetch may improve DON，organic matter and pH of the paddy soil to influence the availability and the forms of Cd.