Introduction The ability to maintain balance is one of the important factors in measuring a person's physical fitness. Aim Analysis of the influence of Sensory Integration therapy on maintaining balance in children. Comparison of the study group with the control group of children who performed the author's general development exercises. Material and methods The study involved 36 children. The study group consisted of 7 girls and 11 boys who attended Sensory Integration classes. The control group consisted of eight girls and ten boys who performed the author's general development exercises.The age was determined, and the children's weight and height were measured. As part of the study, tests were conducted to assess static balance: the Romberg test with eyes open and closed and the one-legged stance test. Dynamic balance was assessed with a straight-line walking test. All children attended classes once a week for 4 months, and the tests were repeated afterward. Results In the study group, after 4 months of therapy, the average results of the tests assessing the vertical body posture in statics and dynamics indicated a significant improvement in maintaining balance (p< 0.05). In the control group, after 4 months, the results of the one-legged standing test and the straight-line walking test indicated a significant improvement (p< 0.0002, p< 0.0003). Conclusion The use of Sensory Integration therapy improved the children's balance. Children with normal muscle tone have the best level of balance.