Without seeing your view specification I'd guess that you are using fields and specifying both the node title (as a link) and the node as a teaser. Therefore, either eliminate the title (the first title) or specify the teaser body (which will remove the second title); or you could use a node (teaser) view.

Hope this helps,
Curt

hi,
yes I am using fields, and I specify node title but not node teaser, instead node: body
I try deleting the node: body, but the node: title still display 2 times

I am using node: teaser -> but it's display the full node

ah now it's solve I should check "exclude from Display"

do you know why it should be like that?

The only reason that I know of to include a field and exclude it from the display is to be able to access it later, with another field, and combine/format the fields together. It sounds like you should be using a node style and then displaying the nodes in teaser mode.

Contact me via email if you'd like to discuss this over Skype or on the phone.

Curt

I am very thankful if you can describe to me later
do you happen to know about openID?
or wiki site?