【移民监/入籍】加拿大保留永居PR和入籍官方规定
（一）申请入籍篇：
四年内住满3年（1095days），其中两年是获得永久居民身份后获得的，计算方法：获得永久身份后，一天算一天，申请入籍四年内，获得永久身份前在加的时间，一天算半天。
2014年2月6日最新消息：
加拿大保守党政府今天(周四，2月6日)提交C-24法案，对入籍法进行重大改革，包括提高对申请入籍者的要求，剥夺恐怖分子和间谍的国籍等内容。这是加拿大入籍法自1977年开始实施以来第一次全面修订。
根据今天提出的该法案，永久居民要提出入籍申请，必须在过去六年期间实际住在加拿大四年方有资格。现行规定在过去四年中住满三年即可。
新法案对“实际居住”的规定也比过去严格：申请人需要出示所得税交纳证据来证明自己在这段时间里确实住在加拿大境内。现行法律对住满三年不要求提供所得税证据。
（二）保留加拿大永久居民篇：
5年内注满2年。
How long must I stay in Canada to keep my permanent resident status?
http://www.cic.gc.ca/english/helpcentre/answer.asp?q=727&t=4
To maintain your status as a permanent resident, there are few requirements you must fulfill. One requirement is the residency obligation. You must live in Canada for at least two years within a five-year period. During this time you must be here physically.
The two years may not need to be continuous. An officer can confirm if your time in Canada counts when you:
re-enter Canada,
apply for a Permanent Resident Card, or
apply to be a Canadian Citizen.
Time spent outside Canada may also count towards the two years if you are:
travelling with your spouse or partner who is a Canadian citizen,
a child travelling with a father or mother who is a Canadian citizen,
an employee of (or under contract to) a Canadian business.
It may also count if you are:
travelling with your spouse or partner who is a permanent resident and works full-time for:
a Canadian business, or
the public service of Canada or a province,
a child travelling with a father or mother who is a permanent resident and who works full-time for:
a Canadian business, or
the public service of Canada or a province.
an employee of (or under contract to) the public service of Canada or a province and you are on a full-time assignment to:
a position outside Canada,
a partner business outside Canada, or
a client of the Canadian business or the public service outside Canada.