The invention provides a specific tag based on computer vision perception and recognition. The specific tag comprises keywords or searches used for query and search in a search engine and a general query searching system. The specific tag adopts two-dimensional codes, bar codes, numbers with specific formats, letters with specific formats, texts with specific formats, special figures, special movements and other image formats which are displayed through self-luminous objects and reflected light objects, and can be used for storing, delivering and publishing key words, searching and so on. Information can be expressed in binary code, Morse code, American standard code for information interchange(ASCII) and so on, and can be encrypted and compressed. The specific tag based on computer vision perception and recognition can be extended to a specific tag based on computer auditory, feeling, taste and olfactory perception and recognition. The invention provides an application system supporting an usage method of the specific tag, and query and searching service can be requested by a non-contact input through perception and recognition, so that the usage method is convenient and safe and has no physical abrasion. The invention also provides a keyword-dedicated specific tag in extended form with unique usage method, which can create a new business model for search business.