To increase search engine ranking, we need to take care on metatag, look for quality link partner, keywords in paragraph, quality related info, smartpage..

But some one say that if our website traffic increase, search engine ranking will increase as well.

Will that be true?

Almost in every case, but not always.

/Andreas

Really? but how is it? I mean, I see that the site traffic and the links are correlated to each other... For example, I have a site KPO, I know it has good traffic since it is ranked and visible now.

I thought web traffic was interrelated with search engine rankings.
you see an increase in one ,you see an increase in the other too...

I think it's exactly the other way : if search engine ranks increase you will see a larger traffic.