A kind of electrical gain ring resonator (EGRR) optoelectronic oscilla tor (OEO) is demonstrated,whose frequency can be precisely tuned by a little cha nge.The electrical gain ring resonator is composed of electrical amplifier,filter and electrical p hase shifter which generates tunable output RF signal by equally controlling the length of ring resonator.The injection locked scheme injects the single loop OEO signal into the electrical gain ring resonator cavity.The frequency of electrical gain ring resonator is pulled by the injected signal,the frequency of the output signal is controlled by the OEO mode which locks electr ical gain ring resonator frequency,and the phase noise is determined by the OEO loop.The setup of this experiment is simple and it realize precise tunable output signal.In the experiment,the length of fiber is 2km and the length of electrica l loop is 0.5m.The structure achieves 11.3GHz fundamental oscillation with 48dB side mode suppression ratio (SMSR ),the tunable range is 239MHz,the tunable step is 100kHz,and the phase noise of the signal is －99dBc/Hz at 10kHz.