The (1-x)CaWO4-xLi2WO4(0≤x≤0.14) microwave ceramics were prepared by the solid state reaction method. The effect of Li2WO4 as second phase on the low temperature sintering and microwave dielectric properties of CaWO4 was investigated. The results showed that the existing Li2WO4 phase can reduce the sintering temperature of CaWO4 significantly; furthermore, with x increase, the optimal sintering temperature of (1-x) CaWO4-xLi2WO4 (0≤x≤0.14) ceramic system decreased. At x=0.1, the (1-x) CaWO4-xLi2WO4 ceramics sintered at 900 ℃ for 2 h presented excellent microwave dielectric properties. The dielectric constant of εr is 9.002, the Q×f is 11.76×104 GHz and the temperature coefficient of resonant frequency of τf is -55×10-6/℃. On this basis,w(CaTiO3)=5.0% was used to adjust the temperature coefficient of resonant frequency to zero. The microwave dielectric properties after adjusting was εr=10.312,Q×f=5.36×104 GHz and τf ≈0.