[iMac] backup Iphone photo by Mac sierra photo apps

Mac using sierra OS with photo apps , when I plug my Iphone6 to mac,

Then open photo apps in imac, when I go to photo apps-> 'photo', look like it will auto import my photo, because I can see my newest photo which inside the 'photo' which at Left hand panel....

I just tested again, take 2 new photo, then connect iphone to my Mac and open photo apps too, then I click the 'Photo' library, it will show up 2 new photo immediately. I Remember if using OLD OS 10.7, I Need click 'import' button for it..

Can I stop this automatic import function? thanks