Abstract: Agriculture is an important source of greenhouse gas emissions. Unreasonable agricultural management increases greenhouse gas emissions and decreases soil absorbed greenhouse gas. The influence of conservation tillage on greenhouse effect comes from two aspects: one is that no tillage can reduce CO2 emission, but the CH4 and N2O emissions are uncertain; the other is that some straw C can release gas into atmosphere and increase greenhouse gas emission, but straw returning can improve carbon sequestration potential and so reduce the total greenhouse gas emissions. Through analyzing the data about soil tillage and straw management on greenhouse gas emission, the research results prove that conservation tillage can reduce greenhouse effect, and can also provide some references for researching agricultural greenhouse effect.