Rice flour is made of rice flour. River powder, also known as Shahefen, is flat in shape. It is a popular traditional food in Guangdong, Hainan, Guangxi, Fujian and Hunan. Rice flour is prepared by washing rice, grinding into powder, adding water to make paste, steaming in a cage, cooling and cutting into strips. Different from "kway teow".

Rice flour is a common snack ingredient in China, Guangdong, Guangxi and Southeast Asia. Originated in Shahe City, Xingtai City 1860 or so, hence the name. Shahefen originated from Shahe in the northern suburb of Guangzhou. After 100 years of continuous circulation, it has become a daily snack food in most parts of Guangdong. It is said that as early as the 1950s of 19, several Shahe people made Shahe powder. Taking advantage of the unique geographical environment, they soaked rice in Baiyun Mountain Spring, then ground it into pulp with a stone mill, filtered it, glued it and cut it into vermicelli, which became the authentic Shahe powder that everyone loved.