Starch is the general term, raw flour and is part of the starch, raw flour mainly refers to potato flour, that is, potato flour or tai bai powder, viscosity, is generally thickened with cold water. Groundnut flour particles are rougher, no luster, high temperature resistance to cooking, so often come to the production of sweet potato variety of vermicelli, such as vermicelli, vermicelli, etc. At the same time, groundnut flour is more absorbent, fried food is more dry, so it is often used to deep-frying sizing.