This paper investigates the function of each step of pharmaceutical information consulting service system. Alternative answer e (knowing the general information of the inquirer and the background information of the inquiry question) helps pharmacists to clarify the questions to be inquired, which is of great benefit to drug information service; C (evaluating, analyzing and sorting out the consulted data) is the most important aspect of drug information service, which can show the pharmacist's literature evaluation ability and skills; B (Follow-up the work effect and establish files) can understand the work effect and further improve the follow-up work. Alternative answers A and D have no corresponding questions.