As far as I heard this new Google update highly attacks on link building. So, does it become important to change our link building strategy or old strategy still good? Please share your ideas about this.

opt for quality back links i.e link on sites that are related to your site.

Penguin is a fight against all existing forms of webspam including link spamming/ trading, aggressive overuse of exact match anchor text, submitting to low quality article/ blog directories etc.

So make sure:
- You have variation in your anchor text
- You are not buying/ exchanging links
- Your website is compelling enough to pull natural backlinks
- You have no over-optimized on-page element

After this update mine Strategy of link building is:
(i)More focused on including good unique quality content in site.
(ii)trying to get do follow quality back-links for site.
(iii)Updating sites with quality material regularly.
(iv)Avoiding over optimization and keyword stuffing.

To get rid off Penguin updates these can help you:-
Too many matching keywords should not point to same url,You should vary it...
Only make quality back links.
Thnx...

After Google Penguin update,You mainly focused on the good,quality and unique contents.If your contents are some spamming then it is harmful for ranking after Google penguin update.

I think we should give more attention on the content and always try to work on high pr website and make some good and quality backlink.

If Google needs fresh content then it does not mean that you will start copying articles.Even i would say that don't rewrite the article or post some content which is already on web.Instead do some research before writing any post and try to deliver everything to your audience.For eg : A kid also knows how to disable facebook timeline,That's next to useless or you are just filling your blog.Write even a single post in a week but that should be best out of you,That single post will be much better than 5 useless post.Some bloggers provide information by dividing into several posts instead they should provide everything in one post.