Paddy field is one of the important sources of CH_4 emission. Hence reduction of CH_4 emissions from paddy soil is of great significance to retarding global climate changes. Being quite high in stability,absorptivity and alkalinity, biochar has drawn extensive attention in the study on how to mitigate CH_4 emissions from paddy field. In recent,a good few researches have been carried out on effects of biochar amendment on CH_4 emissions from paddy field,nevertheless,little has been done on effects of type of the biochar amended on CH_4 emissions. In order to explore effects of type of the biochar amended on CH_4 emissions from paddy fields and their mechanisms,recent progresses in the study on impacts of biochars different in parent material,pyrolysis temperature and pore structure on CH_4 emissions from paddy soils have been reviewed. Results show that biochars vary sharply in property. The amendment of biochar affects CH_4 emission from paddy soil through its effects on soil aeration,soluble organic carbon content,pH and rice plants,and then in turn on activities and abundances of methanogens and methanotrophs. Besides,the effects of biochar amendment were also related to type of soil. In the light of the status quo of the studies at home and abroad on the effects of biochars mitigating CH_4 emissions from paddy soils,directions for future studies in this aspect are proposed with a view to providing some ways of thinking and references for application of biochar to mitigate CH_4 emissions in paddy fields.