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Purpose: This study is to see if the calf muscle movement affects the length of stride, symmetry, and ability to overcome obstacles, and muscle activity in patients with hemiplegia. Methods: Electromagnetic signals were first measured by ankle plantar flexion or muscle testing in a supine position with 12 patient ankle plantar flexor in the standing position. In the second measurement, the length and symmetry of stride are measured through the gait analyzer. In the third measurement, the ability to measure obstacles was measured. The paired- T test revealed a significant difference. Results: After the intervention, the step length was significantly decreased (p<.05), while the speed and failure rate of the obstacle overcoming was significantly decreased (p<.05). also muscle actvitiy was significantly increased (p<.05), and muscle power was significantly increased (p<.05). the different was statistically significant between pre- and post-intervetion. but after intervention, the gait symmetry was no significantly difference (p>.05), between pre- and post-intervention. Conclusion: The results of this study show that the length of stride, ability to overcome obstacles, muscular activity, and muscle strength are increased more after exercise. Therefore, it is a movement that requires patients with hemiplegia to aim for calf muscle exercise because it increases the length of step in their daily lives, overcomes obstacles, and has a positive effect on muscle activity and muscle strength.