http://www.cic.gc.ca/english/resources/manuals/enf/enf27-eng.pdf
第6页
The first PR cards were issued on June 28, 2002, the day IRPA came into force, replacing the paper Immigrant Visa and Record of Landing document [IMM 1000] previously issued to all permanent residents. The PR card increases Canada’s border security by improving the integrity of the immigration process. It also provides cardholders with a convenient and reliable means of demonstrating their permanent resident status when travelling to Canada with commercial transportation companies in a format that conforms to international document standards designed to facilitate examination.
说了800多遍还在问,贴个官网文本自己看吧。。。。。。