Index fund is a kind of fund product which takes a specific index as the target index and takes the constituent stocks of the index as the investment object. 

It builds a portfolio by purchasing all or part of the constituent stocks of the index, so as to track the performance of the target index. At present, the mainstream benchmark indexes on the market include CSI 300 index, S & P 500 index, Nasdaq 100 index, etc. [1] Portfolio solutions and better have published research reports to analyze the performance of 10 asset portfolios from 1997 to 2012. The results show that the performance of index fund investment is better than that of active management investment in 82% to 90% cases.