I want all columns(<td></td>) in a <table></table> have the equal length, how to achieve this?

How to achieve it with CSS or HTML?

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You should use the table-layout property here...

table { table-layout: fixed; }
table td { overflow: hidden; }

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Use CSS:

td{overflow:hidden;width:200px;}

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In CSS, you can use the width property. This can be done inline or as part of a stylesheet. For some more CSS for tables, check out CSS Styling Tables from w3schools.

td {
    width:200px;
}

<td style="width:200px;">

Or, in HTML, check out the colgroup tag, like this:

<colgroup>
    <col width="200px" />
</colgroup>

I personally use the colgroup the most.

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What about:

table { width:100% }
td { width:20% }

(assuming you have 5 td's per row. If you have three, put width 33%, if you have 2 put 50% and so on.

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Set the width (CSS or inline if you wish) to be the same percent value for each column (ideally with a total of 100%). This will allow progressive scaling.

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You can use the width property for the td selector. However, possibly you want to discriminate one table over the other. In that case, you can classify your 'equal-width' table like this:

<table class="equal_width_columns">
    <tr><td>one</td><td>onetwothree</td></tr>
</table>

<table> <!-- just a regular table -->
    <tr><td>one</td><td>onetwothree</td></tr>
</table>

with css like this:

table.equal_width_colums * td { width: 300px; }

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Was searching for this myself. But in my case, the table count was not fixed, hence giving exact percentage was not an option. Found another solution at

http://freachable.net/2007/11/02/AutomaticEqualWidthColumnsInHTMLTables.aspx

Give the cells a very small width. The cells will scale up to fill the available width.

table tr td { width:5%; }