The rise and fall of fund stocks are determined by many factors. The most important factor is the performance of the company. If a company's performance is excellent, investors will have the confidence to buy the company's shares, which will lead to a rise in the stock price, thus promoting the fund's net value. On the other hand, if the company's performance is not as good as expected, investors will lose confidence and sell stocks, which will lead to a decline in the stock price, thus reducing the net value of the fund.

Another factor that affects the rise and fall of fund stocks is the economic situation and market conditions. If the economy enters a downturn, the market atmosphere is weak and the stock price generally falls, which will have a direct impact on the net value of the fund. In addition, policy changes, domestic and international political situations and natural disasters will also have an impact on the rise and fall of fund stocks.

Finally, market psychology is also one of the factors that affect the rise and fall of fund stocks. When the market atmosphere is warm, investors are optimistic and have high confidence in the stock market, which will make the stock price rise and the net value of the fund rise. On the contrary, if the market fever cools down, investors will be depressed, lose confidence in the stock market, and the stock price will fall, thus reducing the net value of the fund. Therefore, understanding market sentiment is a necessary skill that investors should master.