In the Information Age, data science and information technologies are widely applied in many different businesses. Under such a circumstance, an in-depth analysis about the Ecommerce industry is worthwhile. Cosmetics, of particular, is a fast-consuming sector which has become a certain part of people's living expense that cannot be neglected. Therefore, the research chooses a national cosmetic brand, Perfect Diary, whose development is blooming in recent years. By analyzing the marketing strategies adopted by this company with the SWOT approaches, the research shows how high-end technologies have influenced the E-Commerce industry thoroughly. Most importantly, there are some valuable suggestions for the similar digitalized businesses which attempt to improve their marketing plans involved with data and online shopping.