1. According to the Administrative Measures on Customer Identification and Customer Identity Data and Transaction Records of Financial Institutions, which came into effect on August 1 2007, bank transaction records shall be kept for at least 5 years from the year when the transaction was recorded. If it is more than 5 years, some banks may not keep it, but generally speaking, banks will keep transaction records for more than 5 years out of caution, such as 15 years.

2. Method for querying bank details:

1. Method 1. You need to bring your ID card and bank card to the non-cash business window of the bank's business outlets, which will be printed by the bank staff;

2. Method 2: Bring the bank card to the bank outlet for self-service inquiry and printing. Self-service inquiry machine, insert card or passbook, enter password, enter inquiry details page and historical details, enter the date required for inquiry and printing, and inquire about printing process;

3. Method 3: Log in to the personal online bank, open the personal account bill, select the period for querying the bill, export the bill details, save the documents, and then print them by the printer (prerequisite: online banking function is required);

4. Method 4: Download the bank's mobile APP customer service terminal, log in to mobile banking, my account and account details, and you can view the bill flow, which is for inquiry only and cannot be printed (prerequisite: mobile e-banking is required).