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<正>A flow visualization technique is important for various fields such as engineering, medical science,economy.Flow visualization technique greatly divides into the one bv the experiment technique and the one by the calculation method.A subdivision of research for flow visualization is progressing.Here,we are described about recent progress of/low visualization study.Especially,we describe a recent trend of pressure sensitive paint and PIV.PSP has developed to measure conditions distribution of surface pressure.The collaboration with various fields is necessary,for the advancement of the technology of flow visualization.