Zn_0.9Co_0.1O powders are compounded by the solid state reaction and prepared for the high-quality target of depositing films. Zn_0.9Co_0.1O powders are synthesized at various fritting temperatures in order to investigate the structural and optical properties of the powders. The structural properties of a nubby powder are measured by X-ray diffraction(XRD). The optical properties of the target are tested by Raman scattering and ultraviolet photoluminescence (PL) emission measurements,respectively. The results show that the fritting temperature is an important parameter to influence the sample structure. A series of Co substitute Zn and the sample retains original structure in wurtzite lattice with a temperature of 1200 ℃. At the same time the band gap of ZnO crystal lattice is narrowed from the Raman spectrum.