The aim of this study was to determine the effect of leg strength and anaerobic capacity values of children making basketball and athleticism sport on speed performance and blood lactate level. Totally 24 female children at 10-13 age group making basketball and athleticism sport were participated in research. Leg strength, 30m speed running and lactate tests were applied. Besides, 400m maximal running test was applied to determine differences between anaerobic capacity of children making athleticisim and basketball sport. Descriptive statistics Mann Whitney U test, Regression analyze and Wilcoxon test in SPSS 15.0 for Windows package program were used in analyze of data obtained. In the end of research, it was found that leg strength don’t significantly impact on speed performance at each two groups (p>0,05). It was established that athletes had better 400m time than basketballer (p<0,05). It was found that a thletes had statistically lower blood lactate level than basketballer after 400m running (p<0,05) when they were compared with basketballers. As a result, it was observed that there was no statistically relationship between leg strength and speed performance of children making athleticisim and basketball sport, after all there was statistically significant relationship between anaerobic capacity and lactate level.