The white flake or waxy crystal of p-hydroxyanisole is mainly used as polymerization inhibitor of vinyl plastic monomer, ultraviolet inhibitor, dye intermediate, and antioxidant BHA for synthesis of edible oil and cosmetics. Its biggest advantage is that the monomer added with MEHQ does not need to be removed when copolymerizing with other monomers. It can be directly copolymerized by ternary, and can also be used as antioxidant, antioxidant, etc.