现在条件有所放宽,不知道你是否符合.
必须是国泰，华航或者菲律宾航空，否则就必须申请过境签证了。
http://www.delta.com/planning_reservations/plan_flight/international_travel_information/visa_passport_information/index.jspVisa required, except for Nationals of China (People's Rep.),
only if holding China (People's Rep.) passports) and holding a
valid US visa (SEE NOTE 39687) , who are allowed to transit
without visa to/from the USA only via Vancouver International
Airport (YVR) and only on flights operated on aircraft of the
following carriers: Cathay Pacific, China Airlines and
Philippine Airlines (Note: codeshare flight numbers of these
carriers operated by other carriers are not included);
a. if transiting to the USA passenger must:
- arrive on a direct, non-stop flight from Beijing,
Guangzhou, Hong Kong, Shanghai, Manila or Taipei; and
- hold confirmed onward tickets within 24 hours of arrival
(Note: passengers may depart YVR on another carrier); and
- not leave the transit area (no overnight facilities
avaiable);
b. if transiting from the USA passenger must:
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