The effects of CuO addition on the sintering temperature , microstructure, phase composition and microwave dielectric properties of Zn1.8SiO3.8 ceramics were studied in this paper. The results show that, The addition of CuO is helpful to decrease the sintering temperature of Zn1.8SiO3.8 ceramics, its sintering temperature is decreased from 1 350 ℃ to 1 000 ℃.When 5%(mass fraction) CuO is introduced, after sintering at 1 000 ℃ for 3 h, the density of Zn1.8SiO3.8ceramics was relatively high, optimal dielectric properties are obtained:εr=6.5，Q·f=39 373 GHz，τf=-48×10-6/℃.