PVA polymer powder is especially suitable for use as a building mortar additive. It can be used together with the water-retaining agent of hydroxypropyl methylcellulose HPMC to improve cement. Mortar flexibility, water retention, improve mortar adhesion. In addition, the friction of the mortar is reduced, thereby enhancing the work efficiency and quality. Prevent the cracking and falling off of the plastering layer, increase the adhesion strength and smoothness). PVA is a fine particle polymer, easy to disperse in cold water, in water.It can quickly disperse in the cement, and its aqueous solution has good viscosity stability, which can improve many characteristics of cement mortar, and also has the function of capillary, which has adsorption effect.