1. By visiting financial news websites, such as Wall Street News and Sina Finance, these websites usually update the trend and data of the Dow Jones index in real time.

2. The stock exchange platform is also one of the important ways to query the Dow Jones index. You can log on to the website of the stock exchange platform or use its mobile phone application to find the real-time market and trend chart of the Dow Jones index in the corresponding section or page.

3. The official websites of new york Stock Exchange (NYSE) and other exchanges also provide real-time market data of Dow Jones index. You can go directly to the official websites of these exchanges and find the relevant information of the Dow Jones index in the market data section.