If I can just use Auto Layout adapt iPhone Duo Device？

Yes, Auto Layout is a good starting point, as long as the constraints are flexible. Pin content to the safe area, avoid fixed widths and hard-coded screen assumptions, and let views resize with the available space. Apple's guide says standard system components adapt to iPhone Duo's different poses automatically, but custom layouts may need extra work around the hinge and reserved areas.

Try your app on both the outer and inner displays in Xcode's Device Hub, and check that buttons, text, and navigation remain usable as the device opens and closes. Auto Layout can size and position views, but it can't decide whether a two-column layout still makes sense on the smaller display. Apple's guide: https://developer.apple.com/design/human-interface-guidelines/designing-for-iphone-duo