Acoustic emission（AE） analysis on loading process of corroded reinforced concrete beams with different corrosion ratios was carried out at different stress levels. The characteristics of AE signal and the relationship between the AE event location and crack location of the specimens were studied. Results show that the AE event location has good correspondence with the crack location for all the specimens. Therefore it is feasible to determine defect location of corroded reinforced concrete beams by AE technique. Meanwhile, the stress stage of the specimens can be judged based on the growth for number of AE events. With the increase of stress level, the average frequency center of the specimens will be shifted from low frequency to high frequency.With the increase of the corrosion ratio, the number of AE events in the damage process of the specimens will decrease and the total energy of the specimens will decrease.