The invention discloses a
debit card system with a controllable
overdraft function, which comprises a contract signing management module, a limit management module, a
payment clearing module and a repayment management module, and is characterized in that the modules are seamlessly fused with the
core function of a
debit card, the
overdraft process is automatically triggered, a user does not need to apply for a loan independently, repayment can be associated with a saving account of the user, and the user experience is improved. The operation is convenient, and the core attributes of
debit card saving and
payment are reserved. Compared with a traditional debit card, emergency requirements and
risk control are both considered, and the problem of
payment failure when the balance is insufficient is solved; compared with a
credit card, a definite rest-free period and a lower rate are set, and compared with cyclic interest of the
credit card, the method is lower in rate, reduces the use cost of a user, avoids the excessive
overdraft risk through the quota approved based on the deposit balance, the lower rate and dynamic quota adjustment, and is suitable for students, robust users and other groups.