Abstract: In order to reduce the harm of soil temperature on wheat plants when freezing occurs, in 2011 and 2010, the effect of biochar on the soil temperature was studied by using the biochar in wheat field. The results showed that, compared with no applied biochar and applied biochar, applied biochar could improve the minimum temperature of freezing weather, reduce the maximum soil temperature and increase soil accumulated temperature, and had positive effect on the wheat frost resistance.