Polymer cement mortar is a mixture of cement, aggregate, and organic polymers that can be dispersed in water. The polymer may be a homopolymer polymerized from one monomer, or it may be a copolymer polymerized from two or more monomers. The polymer must form a film on the cement particles under ambient conditions and form a strong bond between the cement body and the aggregate. The polymer network must have the ability to prevent the occurrence of microcracks and prevent the propagation of cracks.