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Magnetic properties of 5d transition-metal adatom decorated two dimensional(2D) ployphthalocyanine framework(TM@Pc)are systematically investigated by means of first-principles calculations.Giant perpendicular magnetic anisotropy up to 20.7 meV is found in Re@Pc.After decorating with a homonuclear transition metal adatom,an overturn of easy axis is demonstrated and the magnetic anisotropy energy can be enlarged to over 40 meV for Os2@Pc and Ir2@Pc.The origin of magnetic anisotropy,structural stability and magnetic coupling behavior are also discussed.All the results show that these 2D organic materials can serve as promising candidates for future magnetic storage devices.