Most of self-raising flour is pre-mixed flour mixed with baking powder of medium gluten flour. There is no need to add baking powder to make snacks with this flour, otherwise the finished product will swell too much.

Yeast powder is mainly used to make bread or steamed bread, medium powder and high powder. Its main function is to expand gluten, increase dough volume and make the finished product taste tough. As for the baking powder used for making cakes, although both are called baking powder at the same time, their properties and usage are different.