Stroke is the third cause of mortality after cardiac diseases and cancer. One of the impacts of stroke is a decrease in the functional ability and disturbance of different parameters of the gait as step length, speed, cadence and time gap between both feet, therefore mirror therapy is carried out to restore the symmetry of gait. purpose: The aim of this study was to investigate the effect of activity-based mirror therapy on gait parameters in patients with chronic stroke. Subjects and Methods: Forty ischemic hemiparetic stroke patients of both genders were recruited, the participants were randomly assigned into two equal groups: The control group (A) was treated by a selected physical therapy program only. The study group (B) was treated with activity-based mirror therapy in addition to the same selected program of physical therapy. The treatment was conducted for 45 minutes, with five sessions per week for four weeks. Measurement of selected gait kinematic parameters including step length gap and time gap by using Biodex gait trainer was done for all patients, before and after intervention. The step length gap was measured as the difference between affected and non-affected step length. Similarly, the time gap was measured as the difference between affected and non-affected time of step length. Results: The comparison between pre-treatment and post-treatment within both groups showed a significant decrease in the time gap and step length gap in both groups. Post-treatment comparisons between the both groups showed significant differences in the time gap and step length gap with more improvement in favor to the study group. Conclusion: Mirror-based therapy showed a more profound effect on gait parameters and improve gait symmetry in chronic stroke patients compared to selected program of physical therapy