As a staple food for a long time, ham sausage has a single nutritional component, which can not meet all kinds of nutrition needed by children's growth and development. A certain amount of preservative is added in the production process of ham sausage. These chemical preservatives will not pose a threat to the human body in a small amount, but if they are eaten in large quantities for a long time, they will ingest higher levels of chemicals. When children are enriched by such chemicals to a certain extent, the low-iron hemoglobin in human blood may be destroyed by the substances produced by the reaction between such chemicals and meat, and lose the ability to transport oxygen and nutrition, thus causing children to have dizziness, headache, drowsiness, nausea, vomiting and other symptoms, causing harm to the body.