The purpose of this study was to investigate physical fitness and to construct a test battery for evaluating health-related physical fitness in elemenraty school chileren. The subjects were 473 elemenraty school children aged 9 tp 11. Eleven test items were used used in assessing health-related physical fitness. Principal factor analysis was applied to the correlation matrix consisting of 11 cariables. Then, the first principal component was investigated. This factor correlated with most of cariables at significant level and this ractor had the amount of contribution to the total variance of 3.975. the degree of contribution of 36.13%. The first factor was interpreted as a fundamental physical fitness factor(FPFF). Multiple regression analysis was used in developing prediction equations for HRPF. The multiple correlation between FPFF and 5 HRPF and 5 HRPF cariables was significant(R=0.925. p<.05). The following equation for estimating health-related physical fitness score(HRPFS) was developed; HRPFS= 47.207 + .453X1 The assessment criterion ranking by a 5-point scale in each was constructed using a regression equation to ages.