A segmented temperature compensated bandgap reference with high PSRR was designed in Huahong 0.18 μm BCD technology. The circuit was powered by 5 V power supply, and the reference output voltage was 1.256 V. The simulation results show that in the temperature range of -45-+125 ℃, the temperature coefficient of the traditional structure is 2.048×10-5/℃ at the TT corner. The temperature coefficient of the bandgap reference with new piecewise temperature compensation is 3.631×10-6/℃, which is 82.3% lower than that of the traditional structure. The static power consumption is 220 μW. The PSRR can reach -102 dB at low frequency, and the worst PSRR is -30 dB at 350 kHz. The bandgap reference is suitable for analog integrated circuits of high precision and high current switching power supply.