Abstract: A Bluetooth sensing method for unlocking a door, applied to a system including an electronic device, an electronic door lock, and an authenticator connected to the electronic door lock. The method includes: the electronic device detecting that the distance between the electronic device and the authenticator is smaller than a pre-defined value, the electronic device setting up a Bluetooth communication connection to the authenticator; the processor initiates a mutual authentication process to the controller when the distance is smaller than a pre-defined value; the electronic device automatically transmitting an unlocking instruction to the authenticator; and the authenticator unlocking the electronic door lock according to the unlocking instruction.