In this study, biochar supported nanosized zero valent iron composite (NZVI/BC) was assembled from biochar and nanoscale zerovalent iron (NZVI), while NZVI was prepared by liquid phase reduction method. The XRD patterns showed that NZVI/BC was composed of biochar and NZVI. SEM indicated that NZVI particles agglomerated greatly, and dispersed well after being distributed on biochar grains. The focus was placed on the effects of the solution pH, dosage and ratio of Fe/C for the composite as well as the initial concentration of NO₃^- on the reduction of nitrate by NZVI/BC. The research clearly demonstrates that NZVI/BC exhibits highly efficient reductive capability. The reductive removal rate of NO₃^- reached approximately 75% within 2 h by using NZVI, and reached approximately 96% by NZVI/BC under the same certain condition. Therefore, NZVI/BC is a promising scavenging material for nitrate.