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The aging properties of the protective material are of great importance to ensure the safe operation of the concrete structure during its service life. In this study, the aging properties of a viscoelastic protective coating were investigated. The mechanical properties of the coating under outdoor exposure and high-low temperature cycles were determined. Fourier Transform Infrared Spectroscopy (FTIR) was used to observe the change of chemical structure after aging test. The results show that the tensile strength, the elongation at break and the tear strength decrease by 2.33%, 26.58% and 1.63% respectively after 150 days of natural exposure. The tensile strength, the elongation at break and the tear strength decrease by 32.49%, 39.11% und 30.44% respectively after 100 times of high-low temperature cycles. The natural exposure affects the elongation at break of the coating most, while the high-low temperature cycles have a significant effect on the tensile strength, the elongation at break and the tear strength. FTIR analysis shows that the chemical bonds on the surface of the material are degraded because of natural exposure.