The invention discloses a shifting register unit, a gate drive circuit and a displayer. The shifting register unit comprises a first clock signal input end, a first pulse signal input end, a signal output end, a low level end, a working module and a maintaining module, wherein the maintaining module comprises a low level maintaining unit and a bipolar pulse generation unit; a key transistor of the low level maintaining unit is located below positive bipolar pulse polarization with changed amplitudes and negative bipolar pulse polarization with changed amplitudes through the capacity coupling effect and the voltage feed through effect; and the threshold voltage drifting of the transistor is restrained. The shifting register unit, the gate drive circuit and the displayer have the beneficial effects of being long in service life, simplified in structure, high in yield, wide in application range and the like.