A gate driver of a liquid crystal display includes classes of driving circuits coupled to each other for outputting gate pulses. At least one class of driving circuits includes a shift register and a switch. The shift register outputs the gate pulse corresponding to the class of driving circuit according to the gate pulse outputted by a former class of driving circuits. The switch controls the enable of the shift register according to the gate pulse outputted by the former class of driving circuit and the gate pulse outputted by the class of driving circuit.