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A voltage controlled oscillator with wide tuning range and low phase noise for frequency synthesizer is designed to solve the problem of phase noise deterioration in wide tuning range. A wide tuning range is achieved by using 180nm BiCMOS process with variable capacitor array and switched capacitor array. By adding a noise reduction module, the second and third harmonics generated by the voltage controlled oscillator are filtered out, the output amplitude is increased, and the phase noise is reduced. An output buffer is added to the output of the VCO to reduce the influence of other devices of the frequency synthesizer on the VCO. Cadence software is used to simulate the VCO. The simulation results show that the tuning voltage is 0.3~3V and the output frequency range of the VCO is 2.3~3.5GHz. When the center frequency of the VCO is 3.31GHz, the phase noise at 10 kHz, 100 kHz and 1 MHz offset from the center frequency is -93.21dBc/Hz, -117.03dBc/Hz, -137.41dBc/Hz, and the power consumption is 7.66mW. In a wide frequency range, good phase noise suppression is obtained, which improves the noise performance of VCO and meets the application requirements of broadband low phase noise frequency synthesizer.