Objective To formulate a pharmaceutical service pathway to standardize the pharmacists'whole process of pharmaceutical services for breast cancer patients in medical institutions,promote the standardization of pharmacists'work and improve the rationality of drug use for breast cancer patients in medical institutions.Methods The editorial committee aimed at several challenging problems in the whole process of pharmaceutical services for breast cancer patients in medical institutions through systematic search,referring to the latest domestic and international guidelines and expert consensus of breast cancer and under the relevant drug administration regulations in China,collected and sorted out the professional opinions of doctors,pharmacists,and methodological experts,developed questionnaires and held two rounds of expert argumentation meetings,and finally screened out the most valuable results.The whole process management pathway of pharmaceutical care for breast cancer patients was formulated,and the referral principles of hospitals at different levels and the contents of pharmacist training and assessment were clarified.Results The whole process management pathway of pharmaceutical services for breast cancer patients was developed,including information collection,analysis,evaluation,development implementation of intervention plans,and follow-up.Conclusion This pharmaceutical service pathway can standardize and guide pharmacists in hospitals at different levels to carry out pharmaceutical services for breast cancer patients,achieve the whole process of monitoring drug use,and ensure rational drug use and treatment effectiveness for patients.