The invention provides a 2 dimensional (2D) code applying method and system for an electricity metering device. The method includes the following steps: invoking the device information of an electricity metering device; performing encryption processing on the device information and providing a corresponding identification number for data storage; generating a 2D code and printing the 2D code; adhering the 2D code label to the housing of the electricity metering device; a hand-held device acquiring the encrypted information in the 2D code label; the hand-held device communicating with an identification system and performing identity verification; on the basis of the corresponding identification number, identifying the system and invoking the data; and the hand-held device displaying the data. The 2D code has strong anti-tarnish capability compared with barcodes, and can preserve data a longer time; the basic device information can be known through scanning the 2D code by an electricity-purpose hand-held terminal or an intelligent mobile phone, which is easy to operate; the hand-held device and the identification system establish communication and arrange an identity verification module, which can guarantee information safety; the method and the system are easy to expand in terms of function, can materialize checking of electricity bills and automatic payment, and has wide market promotion and popularization potential.