Optical limiting properties based on reverse saturable absorption and thermal defocusing effect of organically modified sol-gel doped with octa-PdPc were studied. By utilizing this material, one optical limiter for indoor protection against visible pulse and continuous wave lasers was designed. The limiting effect of the limiter can be further enhanced by means of adjusting the size of the aperture or increase of the limiting medium layers. For the light with the wavelength of 488 nm, the transmittance of the limiter is less than 9% when aperture size is 2.2 cm. For lights of 632.8 nm, 514.5 nm and 457.9 nm, they have the similar limiting behaviors as the light of 488 nm.