The incubation experiment was conducted to investigate the effects of straw on the emissions of N_2O and CH_4 in soil under 30 ℃ and flooding conditions. Four types of straws (i.e. soybean straw,peanut straw,bagasse and rice straw) were chosen,while no straws addition was used as control(CK). During 25 d incubation,soybean straw,peanut straw and rice straw could significantly increase soil pH,organic matter,available K content,but rapidly decrease soil Eh. Compared to CK,soybean straw,peanut straw and bagasse significantly reduced soil N_2O emission,and the lowest appeared for soybean straw. Noticeably,soybean straw,peanut straw and rice straw significantly increased CH_4 emissions. Collectively from N_2O and CH_4 emissions, soybean straw,peanut straw and rice straw resulted in higher global warming potential than CK,and the highest appeared for peanut straw. The global warming potential of bagasse treatment was significantly lower than CK,but bagasse treatment did not effectively improve vegetable soil and failed to increase pH and available potassium. Compared with these four kinds of materials,global warming potential is the lowest and the improved effect to soil is the best for soybean straw.