The purpose of this paper is to propose a method to prevent photodegradation of porous Pressure-Sensitive Paint (AA-PSP) and to validate its effect by experiment. AA-PSP is a coating with dye molecules adsorbed on the surface of porous anodized alumina. Among various dye molecules, AA-PSP using Pyrene-Butyric Acid (PBA) has suitable characteristics for a fast responding PSP such as fast time response, high pressure sensitivity, high luminescent intensity and small temperature dependency. However, this PSP has poor photo-stability and is unable to be used for unsteady measurement in which excitation light is higher than steady tests. In this paper, we propose a method to reduce photodegradation of PBA-based AAPSP by using antioxidants. Three types of antioxidants (phenolic, sulfuric, and HALS) were applied on AAPSP and their effects on photo-stability were compared by the aging test conducted with one-hour long continuous exciting irradiation under argon or air. The results of these tests showed that HALS and sulfuric antioxidants were effective in reducing photodecomposition and photo-oxidation, respectively. On the contrary, phenolic antioxidant had no effect on photodegradation. Photodegradation rate of PBA-based AA-PSP can be adjusted by using a combination of HALS and sulfuric antioxidants.