Legumes plays an important role in nitrogen transformation in purple soil，however，nitrogen mineralization and nitrification are important processes in determining the amount of soil availablenitrogen.In thispaper， Vicia faba L.commonly planted in Sichuan and Chongqing was used for green manure materials.They were mulched and incorporated with 0.6 g/100g，1.8 g/100 g and 3.0 g/100 grespectively(Dry weights of green manure / Dry weights of purplesoil).The effect of green manure of Vicia fabaL.on nitrogen mineralization and nitrification characteristics in purple soil was explored by the laboratory aerobic incubation under constanttemperature.The contents of NH 4+-N and NO^3--N，total nitrogen，organicmatter，potential nitrification rate and nitrification intensity of soil under different utilization patterns of green manure were measured，and the amount of nitrogen mineralization and nitrification rate in soil were calculated.The results showed，compared with CK，soil nitrogen mineralization and nitrification rate were obviously improved under the two ways of green manure mulched andincorporated，and they all had a tendency to increase with the increase of application rates of green manure in a certain range.Among them，soil nitrogen mineralization of FY1.8 was the highest，which was 304.21 mg/kg. Compared with CK，it was improved by 302.70 mg/kg.The final nitrification rate of soil nitrogen reached 91.04% to96.80%.It showed that FG3.0 was thehighest，followed by FY3.0 and FG0.6 was thelowest.The content of soil total nitrogen and organic matter，soil potential nitrification rate and soil nitrification intensity were significantly improved by medium and high amount of mulched or incorporated greenmanure and under the same amount of greenmanure，the treatment of incorporated green manure was significantly higher than that of mulched greenmanure( P<0.05).Soil nitrogen mineralization was positively correlated with ammonium nitrogen，total nitrogen and organic matter，and which was significantly negatively correlated with nitratenitrogen.The nitrification rate of soil，potential nitrification rate and the intensity of soil nitrification were positively related to soilpH.In summary，it is an effective way to improve supplying capacity of soil nitrogen in purple soil with ways of green manure being mulched orincorporated，and its effect varies with different utilization patterns and application rates.