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People after stroke have difficulties when they undertaking two tasks simultaneously. To investigate the relationships between dual-task performance and factors such as motor function, balance, cognitive state, and fatigue, to identify factors that have an impact on dual-task performance after a stroke. Thirty-seven people with stroke and 38 healthy participants were assessed with 10-m walking test in different performances which were single-task-based, motor dual-task-based and cognitive dual-task-based. Results were evaluated according to the Rivermead Motor Assessment, the Static balance index, the Mini-Mental State Examination, and the Fatigue Severity Scale. Participants with stroke were slower compared to the control group with the following mean speed values for single-task (M = 0.73 m/s, t = −7.612,  p  &lt; .001), motor dual-task (M = 0.70 m/s, t = −8.232,  p  &lt; .001), cognitive dual-task (M = 0.59 m/s, t = −7.944,  p  &lt; .001). For people after stroke, motor dual-task performance was significantly affected by the total motor function scores (r = 0.648,  p  &lt; .001), static balance (r = −0.499,  p  &lt; .05), and fatigue rates (r = −0.349,  p  &lt; .05). Furthermore, cognitive dual-task performance was affected by the total motor function score (r = 0.537,  p  &lt; .05) static balance (r = −0.541,  p  &lt; .05) and fatigue rates (r = −0.350),  p  &lt; .05). Multivariate factor analysis indicated that impairment in the gross function influenced motor dual-task performance (B = 0.086,  p  = .031) and cognitive dual-task performance (B = 0.083,  p  = .010). Cognitive dual-task performance was affected by leg-trunk function (B = 0.063,  p  = .015) and age (B = −0.006,  p  = .009). The present study indicated that dual-task performance was related to motor function, balance, and fatigue, whereas gross motor function was the unique determinant of dual-task performance.

What are the factors affecting dual-task gait performance in people after stroke?