今天打电话问了移民局，他们说也不知道担保过后需要提供什么材料，叫我问签证中心。我查了一下担保通过的EMAIL，发现我父母的材料可能是由OTTAWA签证中心处理的，因为他们叫我联系OTTAWA：
Should you need to submit additional information or make any further enquiries regarding the
Application for Permanent Residence for your relative(s), you may contact the office indicated below
by e-mail, fax, or in writing as follows:
CPP Ottawa
Case Processing Pilot - Ottawa
NHQ - Centralized Processing Region
219 Laurier Avenue West
Ottawa ON
K1A 1L1, Canada
E-mail:
OttPilot-immigration@cic.gc.ca
Fax number: (613) 946-6059