The mortar powder is spray-dried from vinyl acetate-ethylene copolymer emulsion. The product is designed and produced for practical applications in China. It has stable and reliable quality and high cost performance, and is suitable for the production of various dry-mixed mortars. It is a free-flowing polymer white powder that can be easily re-emulsified and dispersed in water to form a stable emulsion. It can be mixed with other powdered materials such as cement, sand, lightweight aggregate, etc. in the production plant according to a certain ratio in a dry state to obtain a high-quality and easy-to-use dry cement mortar, which can reduce on-site construction Error and inconvenience in mixing and measuring with emulsion. The mortar powder in the mortar mainly functions to improve the bending strength and flexural strength of the mortar, improve the bonding strength and cohesion of the mortar, and improve the impact resistance, durability and abrasion resistance of the mortar.