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i use:
deb http://archive.ubuntu.org.cn/ubuntu breezy main restricted universe multiverse
deb http://archive.ubuntu.org.cn/ubuntu breezy-security main restricted universe multiverse
deb http://archive.ubuntu.org.cn/ubuntu breezy-updates main restricted universe multiverse
deb http://archive.ubuntu.org.cn/ubuntu-cn breezy main universe multiverse restricted
deb http://archive.ubuntu.org.cn/backports breezy-backports main universe multiverse restricted
deb http://archive.ubuntu.org.cn/backports breezy-extras main universe multiverse restricted

but:
root@ubuntu:/home/sunux # aptitude update
Reading package lists... Done
Building dependency tree
Reading extended state information
Initializing package states... Done
Writing extended state information... Done
Err http://archive.ubuntu.org.cn breezy Release.gpg
Could not connect to archive.ubuntu.org.cn:80 (211.148.131.7). - connect (111 Connection refused)
Err http://archive.ubuntu.org.cn breezy-security Release.gpg
Could not connect to archive.ubuntu.org.cn:80 (211.148.131.7). - connect (111 Connection refused)
Err http://archive.ubuntu.org.cn breezy-updates Release.gpg
Could not connect to archive.ubuntu.org.cn:80 (211.148.131.7). - connect (111 Connection refused)
Err http://archive.ubuntu.org.cn breezy Release.gpg
Could not connect to archive.ubuntu.org.cn:80 (211.148.131.7). - connect (111 Connection refused)
Err http://archive.ubuntu.org.cn breezy-backports Release.gpg
Could not connect to archive.ubuntu.org.cn:80 (211.148.131.7). - connect (111 Connection refused)
Err http://archive.ubuntu.org.cn breezy-extras Release.gpg
Could not connect to archive.ubuntu.org.cn:80 (211.148.131.7). - connect (111 Connection refused)
Ign http://archive.ubuntu.org.cn breezy Release
Ign http://archive.ubuntu.org.cn breezy-security Release
Ign http://archive.ubuntu.org.cn breezy-updates Release
Ign http://archive.ubuntu.org.cn breezy Release
Ign http://archive.ubuntu.org.cn breezy-backports Release
Ign http://archive.ubuntu.org.cn breezy-extras Release
Ign http://archive.ubuntu.org.cn breezy/main Packages
Ign http://archive.ubuntu.org.cn breezy/restricted Packages
Ign http://archive.ubuntu.org.cn breezy/universe Packages
Ign http://archive.ubuntu.org.cn breezy/multiverse Packages
Ign http://archive.ubuntu.org.cn breezy-security/main Packages
Ign http://archive.ubuntu.org.cn breezy-security/restricted Packages
Ign http://archive.ubuntu.org.cn breezy-security/universe Packages
Ign http://archive.ubuntu.org.cn breezy-security/multiverse Packages
Ign http://archive.ubuntu.org.cn breezy-updates/main Packages
Ign http://archive.ubuntu.org.cn breezy-updates/restricted Packages
Get:1 http://archive.ubuntu.org.cn breezy-updates/universe Packages [14B]
Get:2 http://archive.ubuntu.org.cn breezy-updates/multiverse Packages [14B]
Ign http://archive.ubuntu.org.cn breezy/main Packages
Ign http://archive.ubuntu.org.cn breezy/universe Packages
Ign http://archive.ubuntu.org.cn breezy/multiverse Packages
Ign http://archive.ubuntu.org.cn breezy/restricted Packages
Ign http://archive.ubuntu.org.cn breezy-backports/main Packages
Ign http://archive.ubuntu.org.cn breezy-backports/universe Packages
Ign http://archive.ubuntu.org.cn breezy-backports/multiverse Packages
Ign http://archive.ubuntu.org.cn breezy-backports/restricted Packages
Ign http://archive.ubuntu.org.cn breezy-extras/main Packages
Ign http://archive.ubuntu.org.cn breezy-extras/universe Packages
Ign http://archive.ubuntu.org.cn breezy-extras/multiverse Packages
Ign http://archive.ubuntu.org.cn breezy-extras/restricted Packages
Hit http://archive.ubuntu.org.cn breezy/main Packages
Err http://archive.ubuntu.org.cn breezy/restricted Packages
Could not connect to archive.ubuntu.org.cn:80 (211.148.131.7). - connect (111 Connection refused)
Err http://archive.ubuntu.org.cn breezy/universe Packages
Could not connect to archive.ubuntu.org.cn:80 (211.148.131.7). - connect (111 Connection refused)
Err http://archive.ubuntu.org.cn breezy/multiverse Packages
Could not connect to archive.ubuntu.org.cn:80 (211.148.131.7). - connect (111 Connection refused)
Err http://archive.ubuntu.org.cn breezy-security/main Packages
Could not connect to archive.ubuntu.org.cn:80 (211.148.131.7). - connect (111 Connection refused)
Err http://archive.ubuntu.org.cn breezy-security/restricted Packages
Could not connect to archive.ubuntu.org.cn:80 (211.148.131.7). - connect (111 Connection refused)
Err http://archive.ubuntu.org.cn breezy-security/universe Packages
Could not connect to archive.ubuntu.org.cn:80 (211.148.131.7). - connect (111 Connection refused)
Err http://archive.ubuntu.org.cn breezy-security/multiverse Packages
Could not connect to archive.ubuntu.org.cn:80 (211.148.131.7). - connect (111 Connection refused)
Err http://archive.ubuntu.org.cn breezy-updates/main Packages
Could not connect to archive.ubuntu.org.cn:80 (211.148.131.7). - connect (111 Connection refused)
Err http://archive.ubuntu.org.cn breezy-updates/restricted Packages
Could not connect to archive.ubuntu.org.cn:80 (211.148.131.7). - connect (111 Connection refused)
Err http://archive.ubuntu.org.cn breezy/main Packages
Could not connect to archive.ubuntu.org.cn:80 (211.148.131.7). - connect (111 Connection refused)
Err http://archive.ubuntu.org.cn breezy/universe Packages
Could not connect to archive.ubuntu.org.cn:80 (211.148.131.7). - connect (111 Connection refused)
Err http://archive.ubuntu.org.cn breezy/multiverse Packages
Could not connect to archive.ubuntu.org.cn:80 (211.148.131.7). - connect (111 Connection refused)
Hit http://archive.ubuntu.org.cn breezy/restricted Packages
Err http://archive.ubuntu.org.cn breezy-backports/main Packages
404 Not Found
Err http://archive.ubuntu.org.cn breezy-backports/universe Packages
404 Not Found
Err http://archive.ubuntu.org.cn breezy-backports/multiverse Packages
404 Not Found
Err http://archive.ubuntu.org.cn breezy-backports/restricted Packages
404 Not Found
Err http://archive.ubuntu.org.cn breezy-extras/main Packages
404 Not Found
Err http://archive.ubuntu.org.cn breezy-extras/universe Packages
404 Not Found
Err http://archive.ubuntu.org.cn breezy-extras/multiverse Packages
404 Not Found
Err http://archive.ubuntu.org.cn breezy-extras/restricted Packages
404 Not Found
Fetched 28B in 7s (4B/s)
Reading package lists... Done
Building dependency tree
Reading extended state information
Initializing package states... Done