Search aim: The aim of the study is to describe the associations between body composition of  Egyptian pre-school children  and their cardiorespiratory fitness Curriculum used: Descriptive method Research Sample and Characteristics: The research sample was randomly chosen and consisted of (400) children who are members of the basic sample from pre-school children in kindergarten stage in Qaliubiya Governorate The most important results: 69.8 % of pre-school children are of abnormal weight (43% obese, 21.5% over-weight &5.3% under-weight). Pre-school children showed poor CRF and there is a strong inverse correlation between body composition measurements like ( body fat & water content) and respiratory fitness measurements like (VC, FVC, FEV1, PEF and VO2max).On the contrary , there is strong direct correlation between body composition and  SBP & DBP , MAP& resting pulse)(P<0.05). Conclusions: There is poor cardio-respiratory fitness among Egyptian pre-school children.