Debian 的生命周期是 5 年，
官方链接 https://www.debian.org/releases/
Release life cycle
Debian announces its new stable release on a regular basis. Users can expect 3 years of full support for each release and 2 years of extra LTS support.
See Debian Releases Wiki page and Debian LTS Wiki page for detailed information.
每个发行版的生命周期
Debian定期发布其新的稳定版本。 每个版本，用户可以期待 3 年的全面支持和 2 年的额外 LTS 支持。
有关详细信息，请参阅 Debian 发行版 Wiki 页面和 Debian LTS Wiki 页面。
https://www.debian.org/News/2017/20170617
Debian 9 "Stretch" released
June 17th, 2017
After 26 months of development the Debian project is proud to present its new stable version 9 (code name "Stretch"), which will be supported for the next 5 years thanks to the combined work of the Debian Security team and of the Debian Long Term Support team.
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https://www.debian.org/News/2015/20150426
Debian 8 "Jessie" released
April 25th, 2015
After almost 24 months of constant development the Debian project is proud to present its new stable version 8 (code name "Jessie"), which will be supported for the next 5 years thanks to the combined work of the Debian Security team and of the Debian Long Term Support team.
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https://www.debian.org/News/2013/20130504
Debian 7.0 "Wheezy" released
May 4th, 2013
After many months of constant development, the Debian project is proud to present its new stable version 7.0 (code name "Wheezy").
This new version of Debian includes various interesting features such as multiarch support, several specific tools to deploy private clouds, an improved installer, and a complete set of multimedia codecs and front-ends which remove the need for third-party repositories.
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https://www.debian.org/News/2016/20160425
Security support for Wheezy handed over to the LTS team
April 25th, 2016
As of 25 April, one year after the release of Debian 8, alias "Jessie", and nearly three years after the release of Debian 7, alias "Wheezy", regular security support for Wheezy comes to an end. The Debian Long Term Support (LTS) Team will take over security support.
Information for users
Wheezy LTS will be supported from 26 April 2016 to 31 May 2018.
引用For Debian 7 Wheezy LTS there will be no requirement to add a separate wheezy-lts suite to your sources.list any more and your current setup will continue to work without further changes.
译文：对于 Debian 7 Wheezy LTS，无需为您的源添加单独的 wheezy-lts 套件到 sources.list，你的当前设置将继续工作，无需进一步修改。
For how to use Debian Long Term Support please read LTS/Using.
Important information and changes regarding Wheezy LTS can be found at LTS/Wheezy.
Most notably OpenJDK 7 will be made the new Java default JRE/JDK on 26 June 2016 to ensure full security support until Wheezy LTS reaches its end-of-life.
You should also subscribe to the announcement mailing list for security updates for Wheezy LTS.
A few packages are not covered by the Wheezy LTS support. These can be detected by installing the debian-security-support package. If debian-security-support detects an unsupported package which is critical to you, please get in touch with debian-lts@lists.debian.org.
Mailing lists
The whole coordination of the Debian LTS effort is handled through the debian-lts mailing list
Please subscribe or follow us via GMANE (gmane.linux.debian.devel.lts)
Aside from the debian-lts-announce list, there is also a list for following all uploads in Wheezy LTS.
Security Tracker
All information on the status of vulnerabilities (e.g. if the version in Wheezy LTS happens to be unaffected while Jessie is affected) will be tracked in the Debian Security Tracker.
If you happen to spot an error in the data, please see https://security-tracker.debian.org/tracker/data/report.
About Debian
The Debian Project was founded in 1993 by Ian Murdock to be a truly free community project. Since then the project has grown to be one of the largest and most influential open source projects. Thousands of volunteers from all over the world work together to create and maintain Debian software. Available in 70 languages, and supporting a huge range of computer types, Debian calls itself the "universal operating system".
Contact Information
For further information, please visit the Debian web pages at https://www.debian.org/ or send mail to <press@debian.org>.