1. Step 1: Select a Word document and double-click it to open it, as shown in the figure below.

2. Secondly, after completing the above steps, in this interface, click the "Insert" option in the toolbar above, as shown in the figure below.

3. Then, after completing the above steps, in this interface, click the "Page Number" option in the toolbar above, as shown in the figure below.

4. Then, after completing the above steps, in this interface, click the "Page number setting" option, as shown in the figure below.

5. Then, after completing the above steps, select "Style" in the pop-up window.

? One, two, three ... "option, and then click" OK "button, as shown in the figure below.

6. Next, after completing the above steps, in this interface, scroll to the third page, and then click the "Page Number Settings" button, as shown in the figure below.

7. Then, after completing the above steps, select "Style" in the pop-up window.

? 1, 2, 3 ... "option, select" This page and later "as the application scope, and then click" OK "button, as shown in the figure below.

8. Then, after completing the above steps, click the "Close" button in the toolbar at the top of the interface, as shown in the following figure.

9. Finally, after completing the above steps, in this interface, set the page numbers of 1 and 2 pages as Roman numerals, and set the page numbers of 3 and 4 pages as Arabic numerals, as shown in the following figure. In this way, the problem is solved.