Measurements of the three-dimensional flow velocity components ( u , v , w ) are carried out around a 2 m Inuid Model M 21 where a specially developed mini five-hole pitot tube of 6 mm diameter is applied satisfactorily. The velocity components are analyzed ( u , v , w -analysis) in a synthetic co-ordination with the corresponding wave analysis (C-analysis) which was previously reported on the same model (M21). The study indicates that, i. e. For potential field ; (1) The two linearized free surface conditions, i. e. the “atmospheric” condition as well as the “kinematical” condition, are both valid either between ζ (measured) and u (measured) or between ∂ζ/∂χ (measured) and w (measured). (2) The behaviour of the transverse component v ( y ) is the most important, because this, component alone can give the unique informations for sheltering effects which are not included in the wave-analysis. (3) The results analyzed from u or w are almost similar to those already obtained by wave analysis. For viscous field ; (4) The flow field analysis is useful also for the refinement of the wake-survey by enabling the quantitative estimation of the disturbance velocity ( u ₁) which is fictitiously presumed within the wake belt.