Swimming is an activity of movement of living beings through water, including maintenance on the surface of the water and movement in the desired direction. It contributes to regulation and improvement of anthropological status in children and adults. In general, swimming at first represented the life need, then it became a cultural value, while today it represents a reflection of the achieved level of civilization, not only of the individual but of the society as a whole. Swimming as a sport has a long history, both in world and in Croatia. The aim of this thesis is to determine whether there is a correlation between the kinanthropological features of the early school-age children with success in swimming and what are characteristics that can affect the result most, by using nine tests to monitor the kinanthropological features (morphological, motorical and functional) of early school-age children in the third and fourth grade. At the very beginning of the work, the theoretical and historical part was covered. Also included is the research chapter whose sample were 36 male and female swimmers of the swimming club "Primorje CO". The results showed that there is a statistically significant relation between the kinanthropological features of early school-age children with success in swimming. Moreover, there is a significant relation between kinanthropological characteristics and there are differences between the results between boys and girls in the tests for monitoring kinanthropological features and swimming tests.