Abstract: During the process of service, polypropylene material is often affected by high temperature, radiation, ozone, moisture, chemical media and mechanical stress, which may cause oxidation and cross-linking reaction within molecules, destroying its structure or components, and ultimately affecting its use value. In this paper, the natural aging process and its impact on the mechanical properties of polypropylene material in comprehensive a polypropylene lication scenarios was analyzed, and the mechanical properties during the aging process was predicted based on experimental analysis and theoretical models. The results show that during the natural aging process of polypropylene material, the decrease rate of tensile strength and elongation at break is relatively fast in the first year. During 1-2 years, the tensile strength and elongation at breakeven remain basically unchanged. After 2 years, the decrease of the tensile strength and elongation at break further accelerates. The effect of natural aging time on the notched impact strength of polypropylene material is not significant, while the unnotched impact strength decreases rapidly in the first year, and then stabilizes after one year. The longer polypropylene material is exposed outdoors, the lower the gloss of the material is. However, the gloss change of the material is significant in the first 1.5 years, and then gradually slows down. The longer polypropylene material is exposed outdoors, the more obvious the chromatic aberration of the material is, and with the time passing by, the chromatic aberration change of the material gradually accelerates. The average error of GM (1,1) model in predicting material properties during the natural aging failure process of polypropylene material is about 3%, and the maximum error will not exceed 4%. The prediction results of this model are relatively reliable.