The CaO-B2O3-SiO2 LTCC powder materials were prepared by the solid state reaction technique.The effects of different sintering temperature and B2O3 contents on the materials’ properties were investigated.The results showed that the degree of densification increased with the increase of sintering temperatures;however,the melt and deformation were occurred when the sintering temperatures were over 975 ℃.The molar ratio of CaO to SiO2 was fixed as 1.2∶1.The sample with w(B2O3) of 25% at 950 ℃ exhibited preferable properties,that is εr=6.06，tan δ=0.001 5(1 MHz),flexural strength σf≥180 MPa,and observed by SEM the densification of sample is good.As the contents of B2O3 increased continuously,the mechanical properties and electrical properties were deteriorated dramatically.