If the money is an urgent issue, you can send it by T/T (or wire transfer) in a bank or WestUnion. But it is quite expansive.
Less fast but cheapter way is to buy a momey order in a bank or Canada Post and mail (or speed mail) to your parent. They can cash it at a bank in China in a few days.
Cheapest way is to mail them a personal check. When they cash it at a bank, they have to wait at least 30 days for the money being transferred into their bank account.