Abstract: The present study investigated the impact of silica sol impregnation on photo-degradation property of moso bamboo(Phyllostachys edulis(Carr.)H. De Lehaie)and explored the possibility to enhance its aging resistance property. The color stability of the moso bamboo before and after accelerated light aging for both silica sol impregnated and control samples were tested. Chemical component changes were examined by the fourier transform infrared spectroscopy(FT-IR). Combined with the results of the scanning electron microscope(SEM)and energy dispersive analysis of X-rays(EDAX), the distribution of silica sol in the moso bamboo and the causes of photo-degradation property variation were explored. FT-IR results showed that absorption peaks at wave number of 1 720 cm^-1, 1 594 cm^-1, 1 510 cm^-1, 1 462 cm^-1, 1 035 cm^-1, respectively, varied after the accelerate light aging, suggesting that the degradation of lignin or hemicellulose happened during the aging. However, after the silica sol impregnation, the absorption intensities at the corresponding wave numbers almost unchanged, indicating that the impregnation was effective in enhancing moso bamboo's aging resistance. Furthermore, chromatic aberration test results also showed that the light aging resistance and color stability were enhanced after the silica sol impregnation. SEM and EDAX test results showed that the silica sol can be filled in cell lumens of moso bamboo after impregnation, which protected the chemical substances from degradation, and eventually enhanced the light aging resistance of moso bamboo. The physical filling, instead of chemical bonding of silica sol in cell lumen of moso bamboo after impregnation, was effective to protect moso bamboo's chemical substances(cellulose, lignin and hemicellulose)from degradation, resulting in decreased chromatic aberration and modified light aging property. It is concluded that the silica sol is feasible to be used for improving moso bamboo's light aging property.