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1.In this work, the tack is taken in the soft safeguard layer before using, so the users fingers will not be stabbed when taking it.2.In using it, the soft safeguard layer will be pressed back gradually and the tack emerges to fix the object.3.After the object has been fixed, the soft safeguard layer will be formed like a flower which can be used to decorate the bulletin board and make the user feel delightful and surprised.4.A series of the tack and the soft safeguard layer can be designed such that a variety of tack types can be selected for increasing the decorative patterns and interest of the bulletin board.