In order to meet the power-management chip's demand for high-precision and low-noise power-supply voltage，this paper proposes a bandgap reference circuit based on the SMIC 180-nm process. The proposed bandgap reference has a basic working voltage of 3. 3 V and a power-supply voltage of 1. 8 V. The circuit uses two currents with different temperature coefficients to process high-order compensation currents to compensate for the high-order nonlinear terms in the base-emitter voltage of the transistor，thereby generating high-order compensation voltages. Using the built-in common-mode feedback，under the action of the output stage，the output's ability to resist power-supply noise is enhanced，so that the overall circuit power-supply rejection ability is significantly improved. The simulation results show that in normal operation，the circuit output voltage was 1. 496 V，and in the operating temperature range of .40 to 110 °C，the temperature coefficient was 3. 801×10.6/°C，and the power-supply rejection ratio was .108 dB at 10 Hz.