This article addressed the production technology of the inorganic powder modified polypropylene spun-bonded nonwoven fabric, and the crystalline structure and crystallinity of the product, along with the cause leading to the change of crystallinity and mechanical properties of the product in the process of light-degradation. The research indicated that addition of the inorganic powder increased the crystallinity and varied the crystalline structure of polypropyiene spun-bonded nonwovens. In the process of light-degradation the crystallinity first increased and then decreased. The inorganic powder can accelerate the process of light-degradation of the product. The higher the content of inorganic powder, the faster the light-degradation. By means of adjusting the production technology and changing the dosage of inorganic powder, economy, functionality and environmental protection can be realized.