The treatment for patients with Duchenne Muscular Dystrophy (DMD) is multidisciplinary. It is necessary to understand the effects of activities performed on dry ground as well as waterimmersed to allow the development of intervention protocols. Objective: To compare the motor function of children with DMD in physiotherapy carried out on the ground and immersed over a 2-year period. Method: A retrospective study, assisted by the Brazilian Association of Muscular Dystrophy (ABDIM), of 23 patients diagnosed with DMD, 8-24 years of age. We collected assessment data both water-immersed (adaptation to the water, bipedalism, sitting position, cross and longitudinal rotation, swimming, and running) and on the ground (Egan Klassifikation Scale and Vignos Scale) over a 2-year period. Results: Analyzing the ratings between semesters during the 2-year period, there were differences in the performance of water-immersed activities (p < 0.001) and there was no difference on the Egan Klassifikation Scale (p < 0.003) or the Vignos Scale (p < 0.012). Conclusion: Due to the physical properties of the water, patients either improved or maintained their scores for motor function in water immersion. However, their scores for the Egan Klassifikation and the Vignos scales, which represent motor function on the ground, diminished.