This study was carried out to research the change of mineral phases and the characteristics(apparent specific gra-vity water absorption firing shrinkage modulus of rupture thermal expansion and specific dielectric constant) of the sintered bodies manufactured by kaolin and limestone. Samples were composed of the same theoretical composition as it of anorthite and fired up to 145$0^{circ}C$ Investigated the change and micro-structure of the mineral phases by XRD and SEM the characterisdtics of the sintered bodies by TMA Automatic Capacitance Bridge and etc. The results were as follow. 1. Reactions of sintering are occurred between 860-95$0^{circ}C$ and 1200-138$0^{circ}C$ and state of bloating is occurred at 1410-145$0^{circ}C$ 2. For the inclusion of feldspar and its fine particles of materials the temperature of producing and collapsing is decreased. 3. Pseudo-wollastonite and gehlenite are formed about 95$0^{circ}C$ 4. At 114$0^{circ}C$ anorthite are begin to forming and increase continuously to 138$0^{circ}C$. Above 141$0^{circ}C$ content of anorthite are decreased. 5. The variations of bending strength with sintering temperature reflect similar trend of sintered contraction and in-crease continuously from 120$0^{circ}C$. At 145$0^{circ}C$ reached about 680kg/cm2. 6. Specific dielectric constant$($varepsilon$_s)$</TEX> of specimen sintered at 141$0^{circ}C$ is 7.12 and that value is most favorable.