A novel optoelectronic oscillator with multiple long fiber loops is proposed. This oscillator can simultaneously have lower phase noise and higher side mode suppression ratio than current multiloop optoelectronic oscillators. A three-fiber-loop oscillator with more than 4 km fiber length is investigated in theory and experiment. The optoelectronic oscillator with frequency of 10 GHz, phase noise of -130 dBc/Hz at 10 kHz offset, and side mode suppression ratio of 60 dBc is demonstrated. The agreement of experimental results and theoretcal analysis justifies this method.