Walking impairment is one of the most common and concerning issues for individuals with stroke. Previous studies have often used improvements in walking speed and distance as reference indicators for gait performance progress in individuals with stroke. However, for people with chronic stroke, it may be more appropriate to prioritize improving gait symmetry and gait variability to enhance gait quality as a primary intervention goal. Additionally, stroke can lead to an imbalance in interhemispheric brain activity, which evolves as motor function recovers. According to the literature review, backward walking may extend the support time of the lower limbs, thereby enhancing the weight-bearing capacity of the affected limb. This, in turn, could promote gait symmetry and reduce gait variability. Changes in brain activity might also accompany such improvements in gait quality. Therefore, this study aims to investigate the immediate, short-term and post carryover intervention effects of backward walking observation training on gait quality in individuals with chronic stroke as well as to explore its effects on interhemispheric activity balance in individuals with chronic stroke.