Hi all,

I use the Dolphin and the feeling is good, and I think it would be better if Dolphin can have a Favourite (book mark) , to save some path location as Windows do.

It already has. If you press F9 key, then side pane will show up. If you right-click somewhere on it, you may add new entry. Entries may be added for Dolphin only or for all KDE applications.

You can also drag-and-drop folders onto the places panel or right-click -> add to Places and it will set up the bookmark for you.
These items will also be available in any of the file open/save dialogs for your convenience.

it really works, thanks very much

Marked as Solved.
I will note this feature exists in all applications which use the KDE File Picker as well.