Active funds are classified according to the different investment concepts of stock funds. Generally, active funds aim at pursuing performance beyond the market. According to different investment concepts, funds can usually be divided into active funds and passive funds (index funds). Active funds generally have a corresponding target index, but active funds usually require the expected annualized income to exceed the target index. Active fund is a fund manager who chooses industries and stocks according to his own ability and invests to obtain income. Grid strategy is a market investment strategy, and its main idea is to buy low and sell high. The grid strategy is to hold orders according to the admission price. For orders that exceed the admission price and are lower than the admission price, the same amount of limit orders are hung in the opposite direction for each transaction to earn the difference. Grid strategy trading does not depend on people's will, and it is purely procedural behavior after setting. Buy low and sell high within the range of market fluctuation, and earn the price difference circularly. The income is relatively stable and the fluctuation is small. When applying grid strategy, we must first find the trading varieties suitable for grid strategy. It is suggested to choose index fund as the trading variety of grid strategy, which will be safer. The best variety is highly volatile. Fluctuation here refers to both the degree and frequency of fluctuation. The stronger the volatility, the greater the possibility of buying and selling, the more times and the more profits. Because index funds track indexes, it is easy to judge the volatility of index funds by looking at the volatility of indexes, and it is more convenient to apply grid strategy.