1. If you want to continue to use it, you should bring your ID card (preferably yourself) when you apply for the discount, and go to the bank to have it reissued. Under normal circumstances, as long as it is a bank in China. After a few years, if you haven't changed it, you can still use it (of course, you need to replenish it before using it), because your deposit information is kept in the bank, and the passbook is only for you to see.

2. If you change your passbook, you can open a new passbook in China Bank and ask the bank staff to transfer the balance to a new account.

There are many reasons for degaussing the passbook (not called demagnetization):

1. The passbook and the mobile phone will be degaussed together;

2. Passbooks will be degaussed when placed around TV, refrigerator and other electrical appliances;

3. Multiple bankbooks and bank cards will also be degaussed;

Extended information

The recorded information of bank cards and bankbooks are all stored on the magnetic stripe on the back, and the strong magnetic field generated by high-frequency electromagnetic waves generated when the mobile phone is working will magnetize the credit card, making the recorded information disordered, thus causing the bank card to be invalid. At the same time, some people put mobile phones, bank cards and other items together in the bag, which can easily cause the bank card to be "degaussed".

in addition, if the magnetic strips of two bank cards overlap, they are likely to be degaussed at the same time. In addition, the magnetic hidden buckle of the lady's bag, the card reader on the bus, and some medical examination equipment such as the nuclear magnetic vibrator will also cause the magnetization of the bank card.

it is recommended to use a clamp sleeve, which can effectively prevent the magnetic stripe from being worn, but it cannot prevent degaussing. Although the ferrule is an insulator, it cannot stop the strong magnetic field.

Baidu encyclopedia-card degaussing