First, you should have over 13,000 points for a round trip from Beijing to Ottawa, the six thousand some points is just for one trip.
Second, since you have already had the card, you will receive a brochure with the redeem details on it. The closest points to redeem will be around 15,000, which is a trip within Zone 1(short haul in North American, would suspect some route like Toronto to Ottawa, etc.)
Go check the details on the brochure or get online www.aircanada.com, logon Aeroplan to view yourself.