The invention discloses a method and system for controlling an elevator. The method comprises following steps: an elevator recognizes a temporary request of a temporary visitor to generate a unique temporary request identifier; a temporary visitor mobile terminal scans the temporary request identifier and establishes a communication link with the elevator; the mobile terminal sends a pledge identifier to the elevator; after the elevator receives the pledge identifier, it opens the use right for the temporary visitor and sends the pledge identifier to a control center; the elevator records thetravel of the temporary visitor and forms a trip log, and then sends the trip log to the control center; the control center saves the trip log; when the temporary visitor ends the use, a payment markis added to the pledge identifier by the elevator, and the elevator sends the trip log and the pledge identifier to the temporary visitor after the temporary visitor receives and agrees to the paymentmark; visitors need to send a pledge identifier to use the elevator; after the temporary visitor uses it, they need to agree to the payment mark to obtain their trip log and pledge identifier to ensure the security of the community and not affect the travel of normal users.