A sensing system is provided. The system includes an electronic device and a detachable sensor. The detachable sensor could be connected to the electronic device through a connecting interface. When the electronic device detects that the detachable sensor is connected to the electronic device, the electronic device obtains a plurality of sensing data, and transforms the sensing data into a plurality of sensing results. Also, when the electronic device is connected to a host device, the electronic device sends the sensing results to the host device.
