Nitride-doped ZnO bulk samples were prepared by solid-state reaction method.Structural, magnetic, and optical properties of ZnNxO1-x samples have been studied.The ZnO lattice parameters a and c increase with the increase of the N content.The dependence of the lattice constants on N concentration indicates that residual N atoms should be reasonably substituted for O atoms in ZnO lattices.The magnetic coercivities of N-doped ZnO samples vary from 60 Oe to 200 Oe, depending on the N concentration, indicating that the films are ferromagnetic at room temperature.The saturation magnetization (Ms) of the N-doped ZnO films increases remarkably with the N concentration x.