Mei, from the parent side, since my daughter has just gone through the Canadian version. For her it wasn't a blocked account but proof of funds in her name or ours, plus a letter showing we'd support her. The part that surprised us was how specific they were about the documents: recent statements, the account holder's name matching the letter, and an explanation for any large deposit in the months before. We had moved money into her account shortly before applying, and we had to explain where it came from, with the paperwork for that too.
My advice for any student or parent: don't move large sums around just before applying. Let the money sit where it is for a while, because a sudden deposit raises questions that take time to answer. And keep every statement.