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For this page, when searching using this, it appears in the description:

Tian Huat Tan, Etienne Andre, Jun Sun, Yang Liu, Jin Song Dong and Manman Chen. Dynamic Synthesis of Local Time Requirement for Service Composition.

But for this page when searching using this, it appears in the description:

Jun SUN. Research Staff. School of Computing National University of Singapore Computing 1 (COM1) ... Email: sunjun (AT) comp.nus.edu.sg ...

Two pages are using tables, but how Google choose the description? And is there any tools that can help optimize the on-page optimization?

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closed as too localized by Stephen Ostermiller Jun 10 '13 at 10:25

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

The description is called the snippet. It will come from various places depending on the query. Google tries show the most relevant content to the user and will often find text which includes some or all of the keywords searched for.

One place to help them is the meta description tag which is very often used as the snippet. Sometimes Google uses a description obtained from DMOZ.

Here are Google's recommendations.

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@ltai, hi I understand that the description tag, I just didn't figure out how the google decide the description itself without description tag, I am figuring the behavior of google crawler that affects the description it appears. – william007 Mar 12 '13 at 3:32
@william007 - Please read the Google link. There is no one place where they take and there is a sophisticated algorithm to decide but Google does not publish exact details, it also changes from time to time as well as by search query. The more recommendations from the link you implement, the better Google's snippet can be. – Itai Mar 12 '13 at 13:35

Google choose description via meta description tag. If webpage don't have any meta description tag, Google automatically take random content from page (here random content is content from starting of web page).

If you want to optimize your webpage, you must have to add meta description tab. For example: <meta name="description" content="some nice content which is appear on Google" />

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