The purpose of this study was to describe the measurement principles of "three-threads-measuring-system" and its applications. 2 figures show exemplary time histories for 3D velocity during freestyle and breaststroke swimming. More detail parameters can be calculated by a self-developed software. Major parameters, including Max velocity, Min velocity, velocity variation, stroke frequency, distance per stroke, are averaged over 10 stroke cycles. Results indicate: 1) freestyle and breaststroke show different cycle characteristics in the 3D velocity curves; 2) velocity fluctuation(y direction) can be used to determine swimmer`s technique characteristics in freestyle.
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