in accordance with article 191 of the property law of the people's Republic of China

during the mortgage period, if the mortgagor transfers the mortgaged property with the consent of the mortgagee, he shall pay off the debts or deposit the proceeds from the transfer to the mortgagee in advance. The part of the transferred price exceeding the amount of creditor's rights belongs to the mortgagor, and the insufficient part is paid off by the debtor.

during the mortgage period, the mortgagor shall not transfer the mortgaged property without the consent of the mortgagee, except that the assignee will pay off the debts and extinguish the mortgage on his behalf.