In the pipeline ADC circuit, the nonlinear capacitance in the gate-voltage bootstrap switch has a direct effect on the on-resistance of the switch, resulting in nonlinear sampling. In this paper, a three-path gate voltage bootstrap switch with high linearity was designed. Three bootstrap capacitors were used to form two main paths and one auxiliary path, which speeded up the gate voltage establishment when the input signal was transmitted to the gate end of the switch through the two main paths. Thus, the signal driving ability was enhanced and the accuracy of the overall circuit was improved. The designed gate-voltage bootstrap switch was used in the sample-and-hold circuit of a 14 bit 500 MHz pipelined ADC. The circuit was designed in TSMC 28 nm CMOS process. The simulation results show that the signal-to-noise ratio (SNDR) of the proposed gate voltage bootstrap switch is 92.85 dB and the spurious free dynamic range (SFDR) is 110.98 dB when the input frequency is 249 MHz and the sampling frequency is 500 MHz.