The invention provides a primer set, application, a product and a method for detecting SNP sites related to drug metabolism in children, and relates to the field of biotechnology. The primer set of the SNP sites related to drug metabolism in children provided by the invention can be used to detect the metabolism capacity of thermoanalgesics, metabolism capacity of respiratory system drugs, metabolism capacity of neurological and psychiatric drugs, metabolism capacity of cardiovascular and cerebrovascular drugs, metabolism capacity of anti-infective drugs, metabolism capacity of endocrine drugs, metabolism capacity of digestion system drugs, metabolism capacity of anesthetic drugs and metabolism capacity of chemotherapy and immunosuppressant. Specific detection of site mutation related to common drug metabolism in children can be realized by the primer set, the accuracy is high, the detection cycle can be tremendously shortened, and the detection cost is reduced at the same time. Moreover, the needs of a drug metabolism can be predicted by the detection results, the metabolism capacity of a variety of drugs can also be comprehensively evaluated, and scientific reference is providedfor the individualized medication of children.