An embodiment of the invention provides a multi-bit flip-flop. The multi-bit flip-flop includes a clock input pin, a clock buffer circuit, and a plurality of flip-flops. The clock buffer circuit is used to receive a first clock signal received from the clock input pin and provide a second clock signal and a third clock signal according to the first clock signal. Each of the plurality of flip-flops is used to receive the second clock signal and the third clock signal and store data according to the second clock signal and the third clock signal. Therefore, the multi-bit flip-flop is designed such that makes each of the plurality of flip-flops to share the same clock.