So the old thread will stay behind even someone reply it recently.
Thanks.

Go to a forum page.
Look at the bottom of the page.
Under the heading "Thread Display Options" look for the pull down menu marked "Sort Threads By."
Change the set from "Last Post Time" to "Thread Start Time."
Click on the button to the far right marked "Show Threads."

JonC
Can't imagine why you'd want to do this.

thanks， I just need to keep a better track of new thread.

Bookmark the thread in your browser.
That way you can keep track of it without screwing up all the rest of data.
JonC