My dear friend 王晚成 ,

You ask about the padchar parameter. That is the character used for filling 
the space between columns.
The meaning of tabwidth is not so simple. To understand that you should 
learn the algorithm. Please read this:

http://nickgravgaard.com/elastic-tabstops/

After getting a firm knowledge you can jump to the package documentation 
page:

https://golang.org/pkg/text/tabwriter/

Search for "Examples" in that page and click on it. Pick one example.
You can see a yellow panel showing example code.
You can run it right in the page! Just click at "Run". Isn't that nice?
You can actually edit the code and run it as many times as you want.
In no time you will get a firm grasp of the meaning of each parameter.

Good luck.

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