Abstract: A review is presented of researches on effect of application of of biochar in reducing nitrogen and phosphorus losses with agricultural non-point source pollution from farmland. From the aspects of mechanism of the effect and soil environment impact of biochar, the emphatically effects of biochar on adsorption and transformation of soil nitrogen and phosphorus in the soil as well as on crop growth and soil leaching processes have been described. Biochar can not only improve soil environment, increase soil available nitrogen and phosphorus, and promote nutrient uptake and growth of crops, but can also hold water and nutrients left unused by crops for late release, thus inhibiting translocation and transformation of the nutrients in the soil and eventually realizing the objective of reducing N and P losses. In the end, prospects, orientation and focal points of the researches in this field are discusses.