1. It depends on whether the fund is established at the same time. Obviously, the net value of the fund established in 2007 will be lower than these two years. (Because the index at that time was much higher than now) 2. Is it the same index? There are many kinds of index funds. Tracking different indexes will lead to different performances; 3. Dividends in history will also affect net worth. Therefore, the choice of index funds depends not on the net value, but on the accuracy of the tracking index: for example, tracking the Shanghai and Shenzhen 300 index funds, the 300 index rose 1%, and the funds that also tracked this index rose the closest. Generally speaking, the bigger the index fund, the more stable it is. (Unlike ordinary equity funds, ordinary equity funds may operate more flexibly and perform better in a small scope. )