这是CFA官网的说法：
Effective 1 January 2011, a valid international travel passport will be required for CFA Program enrollment and exam registration. This applies to all candidates. On exam day, June 2011, candidates must present either their valid international travel passport OR other current government-issued photo ID to be admitted to the test center. On exam day, December 2011 candidates must present their valid international travel passport to be admitted to the test center.
意思是：从2011.1月开始，报名注册考试需要用护照（注意是注册考试时需要）；换句话说，如果你要注册2011.6月的考试，但是是在2011.1月以前报名的，报名注册考试时就可以不用护照，可以用身份证。
               2011.6月参加考试时，要带身份证或护照（注意是“或”，应该是依据你报名时用的证件为准。不过个人觉得要是用护照注册的最好都带上吧）。
               而参加2011年12月考试的考生，就必需且只能带护照参加考试了。

下面也是从官网上找到的表格，写的很清楚：

Exam	Required to register:	Required for admission to test center:
June 2010	Current government-issued photo ID	Current government-issued photo ID
December 2010	Current government-issued photo ID	Current government-issued photo ID
June 2011	Before 1 January 2011: Current government-issued photo ID On or after 1 January 2011: Valid international travel passport	Current government-issued photo ID
December 2011	Valid international travel passport	Valid international travel passport