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IntroductionIn recent years, structured packing has been widely used in chemical and biochemical industries as internals of static mixers,distillation column and bubble column reactor[1,2].Many researchers have studied its hydrodynamic characteristics with the experimental and computational fluid dynamics (CFD) method.And a great deal of papers about the CFD simulations for structured packing have been reported[3-5].But there is still no published work on experimental measurement of the velocity profiles in the structured packing.Considering the lack of experimental validations of CFD simulation results,laser doppler velocimetry(LDV),was used to measure the velocity profiles in the structured packings in this paper.