重點是：要視你規定每一行的字數是以純中文字或純英文字來計算而不一樣。
中文版的word如規定每一行中文字的字數，那就簡單了，就暫不介紹了。
今天要設定的是純英文的，如果規定一行限制60個英文字，這樣要如何設定呢?
1.開啟一個新word文件
2.設定字型成Courier New、 Monaco or Andale Mono
3.字型大小為12
4.算計欄寬：因為12號字在1 inch中可以放入10個字，而此案例要求一行要60個英文字，所以欄寬=60 / 10 = 6 inch，所以請調整左右邊界，使欄寬成為6 inch。
5.設定下圖
完工。
可參考其它網友的解如下：
http://www.ehow.co.uk/how_8296948_limit-per-line-microsoft-word.html
Double-click the Microsoft Word application icon to launch the application. Click the arrow to the right of the assigned font in the font menu bar and select a monospaced font from the drop-down menu. Courier, Courier New, Monaco and Andale Mono are a few examples of monospaced fonts.
Click the arrow to the right of the assigned font size and select "12" from the font size drop-down menu. The font size 12 allows 10 characters per inch, making it easy to limit the amount of characters per line.
Use the equation "Characters per line / characters per inch = Print area in inches" to determine the amount of print area required to limit the amount of characters per line. For example, if you want 60 characters per line, the equation would be "60 / 10 = 6 inches."
Subtract the number obtained in Step 3 from 8.5 and divide the resulting number by 2. The resulting number is the required width of the document's left and right margins. For the example, "8.5 - 6 = 2.5" and "2.5 / 2 = 1.25." The left and right margins for the example document would both be 1.25 inches.
Click the "Layout" tab. In the space labelled "Left" beneath the "Margins" heading, type the margin size obtained in Step 4 and press the "Enter" key. In the space labelled "Right" beneath the "Margins" heading, type the margin size obtained in Step 4 and press the "Enter" key. Each line of the document will now be limited to the desired number of monospaced characters.
