Using particle image velocimeter（PIV）combined with CFD dynamic mesh，an experimental and simulation study was carried out on flow field in the near-wall region outside a vibrating tube.The charts of velocity vector of flow field outside the tube under five conditions with amplitude 1.3 mm and frequency 5—25 Hz were obtained，and the cosine of average synergy angle of flow field outside the tube was calculated.Experimental and simulation results showed that vibration could significantly increase flow velocity in the near-wall region outside the tube，and cause effective scouring on both sides of tube wall in the vibration direction.The average velocity of near-wall region outside the tube showed an approximate linear increase with the increase of vibrating frequency，and reached a peak when resonance condition appeared.In the same region，the cosine of average synergy angle under vibrating condition was greater than that under non-vibrating condition，but there occurred a narrower change of cosine of average synergy angle at different vibrating frequencies.Besides，preliminary measures were proposed to improve heat transfer of vibration surface by analysis of field synergy.