The present application provides a near field information transmission method and system, an information transmitting client, an information receiving client, and an information system. The information transmitting client transmits an acquisition request to the information system. The information transmitting client receives a random number that corresponds to the acquisition request and is returned by the information system. The random number corresponds to the information of said information transmitting client. The information transmitting client uses the random number as a service set identifier of a hotspot, and the service set identifier is broadcast through a beacon frame of a wireless communication protocol. The present techniques conduct near field information transmission conveniently and accurately.