We generally don't choose which type of index base to invest in index funds.
Will not choose the bond index base. Investment index funds hope to get big returns, while bond indexes do not meet the expectations of returns, that is, they are not considered. Broad-based index fund refers to a fairly representative index fund covering a wide range of stocks. Common broad-based indices include SSE 50 Index, CSI 300 Index, CSI 500 Index and GEM Index.