1. Open the Word document and click the button in the lower right corner of the page layout tab; Pop up the page setup dialog box, select the paper tab, select the custom size at the paper size, and enter the corresponding values in the width and height input boxes. The general paper format is that the text is 23cm high and 18cm wide.

2. Double-click the blank space of the ruler bar or the file-page setup-paper size drop-down box, and finally click Customize-enter the width and height below-OK.