An integrated dual-band LC voltage controlled oscillator(VCO) is proposed. This LC-VCO has been implemented with 0.18-㎛ 1P6M CMOS process by TSMC and simulated by Advance Design System(ADS). The output buffer of common source structure reduces reverse isolation. The lower and higher center frequencies of the VCO are 7.57G and 10.46G, respectively. The layout area is 665㎛×860㎛. Tuning range is 0.2%. Phase noise is -112.46dBc/Hz at 7.57GHz and -104.55dBc/Hz at 10.46GHz. The current consumption of the circuit is 28mA through a 1.8V supply.