Abstract: A field experiment was conducted to investigate the effects of rice straw returning and rice straw biochar and life rubbish biochar application on the greenhouse gas (CH₄, CO₂ and N₂O) emission from paddy soil, its physical and chemical properties, and rice grain yield.  Compared with rice straw returning, applying rice straw biochar decreased the cumulative CH₄ and N₂O emissions from paddy soil significantly by 64.2%-78.5% and 16.3%-18.4%, respectively. Whether planting rice or not, the cumulative N₂O emission from paddy soil under the applications of rice straw biochar and life rubbish biochar was decreased significantly,  compared with that without biochar amendment. Under the condition of no rice planting, applying life rubbish biochar reduced the cumulative CO₂ emission significantly by 25.3%. Rice straw biochar was superior to life rubbish biochar in improving soil pH and available potassium content. Both rice straw biochar and life rubbish biochar could increase the soil organic carbon content significantly, but had less effects on the soil bulk density, total nitrogen and available phosphorus contents, cation exchange capacity (CEC), and grain yield. It was suggested that  compared with rice straw returning, straw biochar was more effective in improving rice grain yield.