Answers:
这篇知识库文章应该告诉你如何做到这一点
确保在Mac系统偏好设置中正确配置了MobileMe帐户，并且您正在使用宽带Internet连接。
启动iPhoto并通过选择确定您正在使用的iPhoto版本iPhoto > About iPhoto。
如果您使用iPhoto '11（版本9）：
1 Open iPhoto.
2 Choose iPhoto > Preferences.
3 Click Accounts at the top of the preferences window and make sure that your MobileMe
account is visible on the left. If not, add your account by clicking the plus sign
and entering your MobileMe username and password.
4 Select your MobileMe account under the Web section of the iPhoto source list.
5 Double-click on each individual album in your Gallery and wait for any new photos
in the album to download to your computer. A photo is completely downloaded when
the word “pending” no longer appears on the bottom of the photo.
6 Once all photos have been downloaded you can drag and drop photos from each of your
galleries to Photos in the left hand column to ensure that they are in your main iPhoto library.
如果您使用iPhoto '08（版本7）或iPhoto '09（版本8）：
1 Open iPhoto.
2 Choose iPhoto > Preferences.
3 Click Web at the top of the preferences window.
4 From the "Check for new published photos menu", choose Automatically
and then click the Check Now button. Then, dismiss the window.
5 In the left hand pane of iPhoto, expand MobileMe Gallery and click on each album, one
by one. As you click each album, a spinning icon will indicate that iPhoto is checking
MobileMe for any photos that have not yet been synced to your computer. If any photos
are found, they will be downloaded automatically.
6 Once all photos have been downloaded you can drag and drop photos from each of your
galleries to Photos in the left hand column to ensure that they are in your main
iPhoto library.