Abstract: A capability open platform, a device identification method and a gateway for implementing PNP management of a terminal device are provided, wherein the capability open platform is used to identify a terminal device which has not been connected to a gateway according to the label information uploaded by the gateway, thus implementing the PNP of the terminal device which is not supported. The method includes that the gateway acquires the label information of a terminal device by a terminal authorization mechanism, calls the device identification service of the capability open platform to identify the terminal device that has not been connected to the gateway. The disclosure enables the gateway to identify the terminal device which is not under the protocols supported by the gateway but needed to be connected, so as to be compatible with PNP management and service of all a terminal device.