1, Dow Jones ETF: investors can buy ETFs that track the performance of the Dow Jones index. The performance of these ETF funds is closely related to the Dow Jones index, and investors buying these ETFs is equivalent to buying the stock portfolio of the Dow Jones index in the market.

2. Options and futures: Investors can use Dow Jones index options and futures to invest. These financial derivatives allow investors to invest in the future trend of the Dow Jones index and profit from it.

3. Index funds: Investors can buy index funds that track the performance of the Dow Jones index. These funds track the rise and fall of the Dow Jones index by investing in stocks included in the Dow Jones index.

4. Option warrants: Investors can also use option warrants to invest. Option warrants usually exchange income through the monetary value or price change of physical assets.