Recently, biochar as a new soil conditioner and adsorbent has become a hot spot concerned in agriculture, environment, energy and other fields. Biochar is produced by organic matter pyrolysis in absence of oxygen. Different raw materials and production conditions will produce biochar properties. Biochar can improve soil fertility, bulk density, total porosity and water retention, and also can adjust soil pH, enhance soil cation exchange capacity (CEC), improve soil nutrients. This paper summarized biochar producing method, its physical and chemical properties and its effect on soil physical and chemical properties, thus provided theoretical support to optimize biochar, upgrade the added value of it products, and promote the soil improvement.