The research aimed to study the effect of changing training loads during the Tapering on some hormonal and hematological variables and their effect on the level of swimmers, and the researcher used the Experimental method t for a sample of (21) swimmers, and from the research tools: hormonal measurements - hematological measurements - time measurements, The researcher used the SPSS statistical program with the aim of obtaining the arithmetic mean - standard deviation - improvement ratios - torsion coefficient, and among the most important results: improvement of hormonal and hematological variables (T4-T3-Endrophen-Hb-WBC-WRC) in blood, which is a predictive indicator of improvement in the digital level. The researcher recommends: the use of hormonal and hematological indicators and variables in the selection processes of swimmers, and the codification of training programs in accordance with the capabilities of the swimmer and his job capabilities. Keywors: hormonal, hematological.