We have been prepared a good quality Zn₂SiO₄:Mn phosphors using MnCO_3, MnO and MnO₂ as activators by the solid state reaction method. The luminance properties, color purity and crystalline qualities were investigated as a function of the firing temperature and activator concentrations. In the Mn doping range from 0.005 to 0.12(g-atom/㏖) in Zn₂SiO₄:Mn, the phosphors doped with Mn concentration of 0.08 (g-atom/㏖) showed the highest intensity of emission spectra and good color purity at the firing temperature of 1400℃ for 8hrs under air atmosphere. As the Mn contents increased, the maximum of emission spectra shifted slightly toward higher wavelength. From the SEM micrograph, it was found that the phosphors were composed of a great number of small grains about 1∼2㎛. The XRD analysis showed the typical rhombohedral crystal structures.