The invention discloses a method for searching data efficiently based on expending Tag cloud. In the method, an orthogonal list is adopted based on a sparse matrix realization algorithm, as the orthogonal list can only contain data and can not provide functions of retrieving or positioning, the orthogonal list is modified in a mode of combining a hash list and an AVL tree, so that quick positioning of data is supported, and retrieving support is provided. The invention transforms the Tag from a common label to an assignable container. Therefore, the label not only provides the function of classification, but also contains certain information, and provides more particular function of positioning by the information.