Objective To compare the difference of gait parameter and symmetry between single task walking and double-task walking with different types and different loads in community stroke patients. Methods The gait parameters of 20 community stroke patients in chronic convalescence during single task walking, cognitive double-task walking and motor double-task walking with different loads were collected by Simi Motion threedimensional (3D) motion analysis system, and the symmetry index (SI) was calculated indirectly. The singlefactor repeated measure variance analysis was used to compare gait parameters and symmetry differences between single task walking and walking with different double tasks. Results Compared with single task walking, the walking speed, step length of affected leg side and the swing phase proportion of healthy leg side in community stroke patients during intervention of high-low load cognitive tasks were decreased (P<0. 05), while step width of healthy side and the support phase proportion of healthy side and affected side was increased during intervention of difficult cognitive tasks, stride length of healthy leg side and the swing phase proportion of affected leg side swing was decreased, and the SI of the swing phase proportion decreased (P< 0. 05). Conclusions Community stroke patients mainly deal with cognitive task interference by reducing walking speed, reducing step length, reducing swing phase proportion, increasing step width and support phase proportion, and changing gait patterns. For gait stability, the intervention of high-load cognitive tasks will increase the asymmetry degree of swing proportion of community stroke patients and reduce their gait stability.