It helps to avoid blind spots and control risks. More and more fund companies tend to introduce quantitative strategies. There is a background that can't be ignored, that is, the depth and breadth of China's securities market can't be compared with previous years. "Now there are more than 2,000 listed companies on the market. Only a few hundred companies can keep track of our fund managers, researchers and sellers. With the help of computers, we can avoid some blind spots. " The fund manager of a small and medium-sized fund company said this. Wang Yonghong, the proposed fund manager of Nuoando Strategy and director of Nuoan Financial Engineering Department, believes that the market has its own operating rules, and whoever can grasp this rule can make money. At present, funds in the domestic market adopt various investment methods, including value investment, growth investment, theme investment and style investment. However, the A-share market fluctuates greatly, and it is difficult to win by sticking to only one strategy in different market environments. Wang Yonghong said that Noando's strategy is to formulate an investment model suitable for the current market situation on the basis of analyzing a large number of historical data, comprehensively considering various investment methods, and relying on computer and data statistics, and make investment decisions according to the output results of the model. Although New Zealand's new trend doesn't emphasize its quantitative characteristics, it is understood that new york Mellon Group's iFlow is introduced into its investment strategy to predict the style transformation of A-share market, which provides reference for the adjustment of the stock-debt ratio. Juck Zhang, the helm of Zishi Investment, also said in an interview with the New Express reporter that many funds achieved good results in the first half of the year, mainly due to the company's two-part portfolio investment strategy, which is value investment plus quantitative investment. Its core is to control the risk through quantitative investment strategy, cooperate with active investment strategy, and obtain the excess return of the market under the controllable risk.