1. official website, a fund company: investors can go directly to a fund company in official website and buy index funds at a certain discount. At the same time, different bank cards have different discounts, but only the funds of fund companies can be purchased, and the selection range is relatively narrow.

2. Banks: Banks sometimes sell funds on commission, but it should be noted that funds sold on commission usually have no preferential rates, which is equivalent to increasing the cost of investors.

3. Securities companies: You can also buy science and technology innovation board Index Fund directly from securities companies, but you need a securities account.

4. Third-party platforms: Third-party platforms can enjoy preferential treatment when purchasing science and technology innovation board index funds, and it is also convenient to purchase and redeem them.