The present application provides a method and system for providing and verifying a two-dimensional code. During operation, the system receives, from a terminal of a first user, a two-dimensional code generation request comprising service data, which comprises at least an identifier of the first user. The system obtains a picture that is identifiable by naked eyes, associates the obtained picture with the identifier of the first user, and stores the association between the obtained picture and the identifier of the first user. The system generates a two-dimensional code based on the service data or based on a combination of the service data and the obtained picture and provides the two-dimensional code and the obtained picture to the first user, thereby facilitating the first user to display the two-dimensional code and the obtained picture when providing services.