The effects of lead-borosilicate glass frits on the sintering behavior and microwave dielectric properties of ceramic-glass composites were investigated as functions of glass composition of glass addition ($10{sim}50vol%$), softening point (Ts) of the glass, and sintering temperature of the composites ($500{sim}900^{circ}C$ for 2 h). The addition of 50 vol% glass ensured successful sintering below $900^{circ}C$. Sintering characteristics of the composites were well described in terms of Ts. PbO addition in to the glass enhanced the reaction with $Al_{2}O_3$ to form liquid phase and $PbAl_{2}Si_{2}O_8$, which was responsible to lower Ts. Dielectric constant(${epsilon}_r$), $Q{ imes}f_0$ and temperature coefficient of resonant frequency (${ au}_f$) of the composite with 50 vol% glass contents ($B_{2}O_{3}:PbO:SiO_{2}:CaO:Al_{2}O_3$ = 5:40:45:5:5) demonstrated 8.5, 6,000 GHz, $-70;ppm/^{circ}C$, respectively, which is applicable to substrate requiring a low dielectric constant. When the same glass composition was applied sinter $MgTiO_3;and;TiO_2,;at;900^{circ}C$ (50 vol% glass in total), the properties were 23.8, 4,000 GHz, $-65ppm/^{circ}C$ and 31.1, 2,500 GHz, $+80ppm/^{circ}C$ respectively, which is applicable to filter requiring an intermidiate dielectric constant.