The present disclosure illustrates a trigger circuit applied to an electronic apparatus having a plurality of triggers, which includes a trigger switch and a trigger network. The trigger switch, corresponding to one of the plurality of triggers, has a first end and a second end, in which the first end of the trigger switch is connected with a pad, and the second end of the trigger switch is connected with a voltage source having a first voltage value. Further, the trigger network, corresponding to a rest of the plurality of triggers, has at least one trigger sub-circuit electrically connected with the pad, in which the trigger network has an impedance value. When the trigger switch is triggered, due to an impedance value of the trigger network, the first voltage value will be detected at the pad.