Water-soluble starch white or white-like powder, odorless and tasteless. It is a low-level hydrolytic product between starch and amylose, controlled, with strong hydrolytic properties, soluble at normal temperature, good moisture-bearing viscosity, good carrier effect, almost no sweetness or unsweetness, strong heat resistance, not easily browning, good emulsification and thickening effects, low moisture absorption, not easily clotting, good membrane formation properties, and other advantages.