An electronic fuse system includes: a pad, an electronic fuse circuit, a first switch circuit, and a control circuit. The pad is used for receiving a reference voltage. The electronic fuse circuit is used for changing a voltage level when a current signal passes. The first switch circuit is coupled between the pad and the electronic fuse circuit, for controlling the first switch circuit to be disabled or enabled according to a switch control signal. The control circuit, coupled to the first switch circuit is for transferring the switch control signal according a control signal and a lock signal.