The optical limiting properties of eight-bromo-2, 3- Naphthalocyanine Zinc(II) were studied by using of double frequency ns/ps Nd:YAG laser system at 532 nm with pulse width of 21 ps. The optical limiting properties of a novel Naphthalocyanine are better than those of Fullerene toluene solution. By using the singlet excited absorption theory, optical limiting properties were analyzed, the theoretical fitting results of excited state absorption agree well with the experimental result of optical limiting. The singlet excited state absorption agree well with the experimental results of optical limiting. The singlet excited state absorption is the predominant mechanisms causing the optical limiting properties.