Node energy of sensors in wireless sensor networks（WSNs） is limited

in order to effectively transmit the tested data to remote collectors

and to improve the efficiency of WSNs communication in fading wireless channel

a WSNs based on finite feedback opportunistic beamforming（OBF） is proposed.In WSNs

the base station（BS） is equipped with multiple antennas and the sensor node is equipped with a single antenna

which constitutes a MISO system in which the BS selects the sensor node in peak state to communicate in every slot.Set a feedback threshold

receiving signal to interference and noise ratio（SINR） will be quantized and fed back to the BS when SINR is more than the pre-set feedback threshold

otherwise perform no quantization and feedback.The best feedback threshold and quantized levels are chose based on maximizing throughout.The proposed system is simulated in the Rayleigh block-fading channel

and the experimental results show that with the number of nodes increasing

the number of feedbacks of the proposed system will decrease below 1 % of traditional analog feedback

so decreases feedback quantities greatly

improve efficiency of the system and node energy utilization.