A kind of bandgap reference circuit without operational amplifier was designed. By using the voltage self-adjusting technology to stabilize output reference voltage, the PSRR of the proposed bandgap reference circuit was raised. At the same time, due to without the operational amplifier, the circuit avoided the effect for output voltage caused by op-amp offset voltage, which improved the temperature coefficient of the reference, and reduced the complexity of the circuit. Based on a 0.18 μm BCD process, the PSRR of the circuit is -94 dB at 10 Hz and -44 dB at 1 MHz by simulation under Cadence environment. And the temperature coefficient is 4×10-6/℃ in the temperature range of -40-+125 ℃. Including the start-up circuit, the static current of the bandgap reference circuit is about 14 μA, and the on-chip area is about 0.016 mm2.