I have changed the domain name of my site, so the url of article images are wrong now, they all points to the older url.

How can i do to solve it without edit every article?

You can't. It's a bug in Geeklog which will hopefully be fixed soon.

If you have a ton of articles and don't want to edit all of them, you could try the following:

1) Backup your database
2) Open up the backup file in a text editor
3) Do a search and replace, replacing all instances of your old domain with your new one.
4) Import the altered database
5) Pray

Hopefully that will work!

Thank you Turias.