The effect of application of rice straw and Chinese milk vetch on the species and ecological effect of added copper in a red soil and a fluvo aquic soil was studied by pot experiments. The two organic materials both significantly reduced the content of exchangeable Cu while increased stably organic bound Cu and amorphous Fe bound Cu. The contents of exchangeable Cu were negatively correlated with pH and the contents of stably organic bound Cu. Rice straw and Chinese milk vetch significantly inhibited th...