Fuente: Wipo "BigData" The invention provides a working method for executing a smart city operation instruction through a big data platform. The working method comprises the following steps: S1, logging in a cloud smart platform through a mobile smart handheld terminal; S2, judging whether login succeeds, and if login succeeds, executing the step S3; if the login fails, returning to the step S1; S3, after login succeeds, employing the mobile intelligent hand-held terminal for querying and changing data of the mobile intelligent hand-held terminal. According to the invention, after the mobile intelligent handheld terminal is used for logging in the cloud intelligent platform, the data query and change can be realized.