Acetyl butane-1,4-dioic acid dimethyl ester is used for the synthesis of tartrazine, as a synthetic pigment, tartrazine has many advantages such as strong coloring ability, stable coloring, easy control of pigment purity, low production cost, relatively high safety and basically non-toxic, etc., tartrazine is mainly used as a food additive, and can also be used for the coloring of food, beverages, medicines, feed and other products, and can also be used for packaging, fertilizers, etc.