The water-retaining properties of GinShiCel® cellulose ether can effectively reduce the moisture of mortar absorbed by the multi-void substrate, promote better hydration of gel materials, and greatly reduce the probability of early mortar drying and cracking during large area construction. Its thickening ability can significantly improve the wetting ability of wet mortar on the base surface, make the wet mortar more stable, reduce or avoid delamination, bleeding, improve the lubricity and rheology of mortar; When the modified cellulose ether is applied to the thick layer mortar, it can provide excellent anti-hanging performance, reduce the construction time, greatly improve the efficiency and save the cost, and finally improve the bond strength of mortar.