Quantitative investment generally refers to the investment made by using quantifiable rules, while the active quantification we often say is the combination of quantitative investment and active investment. At present, the mainstream strategy is multi-factor stock selection, in addition to event-driven, CTA, etc. They all invest according to certain rules and belong to the category of quantitative investment. In addition, the product of the combination of active quantification and passive investment appears the index enhancement fund. Some index enhancement funds may be partially copied, while others are actively invested according to the industry.