Ceramic tile adhesive and joint filler are mortars specially used for the paving and joint-filling of ceramic tiles, and most of them are cement-based. Ceramic tile adhesive and joint filler with excellent workability, wettability and sufficient open time can effectively solve the problems such as poor adhesion, shrinkage, cracking and slipping which always exist in traditional cement paste or plaster. Through the synergistic effect of cellulose ether and starch ether, the anti-sagging and anti-slipping abilities can be significantly enhanced while improving the workability. It is necessary to add a certain amount of polymer powder to make the tensile adhesive strength of ceramic tile adhesive / joint filler reach the related standard. Calcium formate can increase their early strength at low temperature.