first of all, the answer is yes: it is suitable for fixed investment. Index funds are very suitable for

LOF index funds with fixed investment, such as Harvest 3 Fund, which is the same as general index funds: they are all index funds, and they all track a certain index.

The difference is that ordinary funds can only be traded over the counter, such as buying and redeeming in banks; LOF funds can be traded both inside and outside the market, that is, in addition to trading like ordinary funds, etf funds can also be traded with shareholders' accounts in securities companies. Similar to LOF funds, they can also be bought and sold like stocks, but a package of stocks must be used for subscription and redemption, which has the advantage of making ETF funds track more accurately. However, it brings disadvantages: the starting point of purchase and redemption is too high for ordinary investors to invest.

so ETF linked fund was born. Etf Linked Fund invests money in the etf fund it contacts, so the trend of the net value of ETF Linked Fund is consistent with the underlying index. At the same time, the investment threshold of etf linked funds is lower than that of etf funds, just like ordinary funds, so that ordinary investors can invest.