The effects of metakaolin， glass powder and limestone powder on the strength and thermal expansion coefficient of cement paste were studied. The hydration products， pore structure and microstructure of cement paste were also studied by thermogravimetric analyzer， mercury intrusion porosimetry and scanning electron microscope. The results show that the thermal expansion coefficient of cement paste decreases with the increase of content of metakaolin， glass powder or limestone powder.The addition of metakaolin can increase the hydration product， decrease the porosity， improve the microstructure， increase the compressive strength and decrease the thermal expansion coefficient of cement paste； the addition of glass powder can decrease the hydration product， increase the porosity， and greatly reduce the strength and thermal expansion coefficient of cement paste； the strength and thermal expansion coefficient of cement paste with limestone powder decrease the most.