Dry powder mortar, also known as dry mortar and dry mixed mortar, refers to a granular or powdery mixture of fine aggregate inorganic cementing material, water thickening material, mineral admixture and additives produced by a professional manufacturer, which is produced by a professional manufacturer. Generally speaking, there are mainly yellow sand, cement, thickening powder, fly ash and admixture. In addition, additives such as early strong agent and fast drying agent are added according to the requirements of the varieties. It can be transported to the construction site in the form of packing or bulk. It can be directly used according to the prescribed proportion and water mixing.