How to import an dragon age origins save in dragon age II in Xbox 360 ??

When you start a new game, you won't get the option to import a save file straight away. The game starts with a playable prologue, after which you enter character creation.

In the character creation scene, select Events of Dragon Age Origins, then Import from Origins (Your Save). It may take a while to load. After that, select the character and save file you want to import.