A banking computer system with lock for secure payment via telephone and corresponding method, the system includes a telephone (1), a public communication system (2), a financial computer account system (3), wherein the financial computer account system (3) usually locks its user account (3-7), assigns a private phone number (6) to a user, and sets unlock information (8) associated with the user account (3-7) in the system. Once the user is connected to the financial computer account system (3) using the telephone (1) with the private phone number (6) through the public communication system (2), the financial computer account system (3) will check the unlock information (8) according to a predefined program, if the unlock information (8) is authenticated, the user account (3-7) will be unlocked for a predefined time, otherwise, the user account cannot be unlocked, the secure payment is therefore achieved by adding an unlock procedure which can be controlled by user.