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The aim of the present study is to compare swimmingstroke characteristics of young national Olympicswimmers and swimmers from Olympic PreparationCenters of Turkey in Adana (TOPC) by usingunderwater video record system. Anthropometricand skinfold thicknesses of the swimmers’ were measured.Body fat and body mass indexes were calculated.50m front crawl swimming performanceswere recorded with an Underwater Moving CameraSystem. Statistical analysis procedures were carriedout by using SPSS-V21 software with IndependentSamples t-Test and Mann Whittney-U test. The significancelevel was accepted as p<0,05. Time, velocity,stroke count (SC), stroke rate (SR), stroke length (SL)and stroke index (SI) parameters were calculated byusing an Underwater Analyze Software. There were nosignificant differences between swimmers’ body massindex, body fat percentage, ectomorph, endomorph,hand and foot length data (p>0,05). Body mass, armspan, mesomorph, muscle and bone percentage of nationalswimmers were found significantly higher thanTOPC swimmers (p<0,05). Time, average velocity and SIdata of the national team were found significantly betterthan TOPC team swimmers (p<0,05). There were nosignificant differences found on SC, SR and SL data oftwo groups (p>0,05). The results of our study show thatdefining the data expressing female swimmers’ strokecharacteristics and analysis have great importance toimprove swimming performance. We posit that developingstroke length, stroke index and consequentlyswimming techniques are essential to achieve elite-levelperformance improvement in the long term.