How to transfer contacts from iPhone to Mac?

Before the first sync for this data, enter one contact in the Address Book on your Mac. Make the contact up if needed, which can be deleted later. This will provide a merge prompt with the first sync for this data, which you want to select. Syncing contacts with the Address Book is selected under the Info tab for your iPhone sync preferences with iTunes.

When you plug your iPhone into iTunes go to the info tab and then make sure you have sync contacts checked and then from the drop down box select one of the programs listed and then click apply. You should then be able to open the program you selected in the drop down box and your contacts should be there.
Besides what said above, a same article about [how to transfer or copy contacts from iPhone to Mac|http://www.softwarebbs.com/wiki/How to_transfer_contacts_from_iPhone_to_Mac,_copy_iPhone_contacts_onMac], which can help you transfer contacts from iPhone to Mac for backup.
Cheers.

Not if the supported address book application on a new or existing computer is empty. Doing this with an empty supported address book application on your computer will erase all contacts from the iPhone. See my previous post.