Going to Canada on business, I don't know what kind of invoices or receipts are provided for hotel accommodation. Can I use them for reimbursement in China?

As far as I know, this is a receipt that anyone can print out. I don't know if your company recognizes that the receipt is not stamped, but the name, telephone number and address of their hotel will be on it. That is to say, if your company has any questions about this receipt, you can call them. They acknowledged this invoice.