The method of analyzing the spatial characteristics of pedestrian walking facilities is presented in order to improve the internal spatial layout for pedestrian evacuation. First, the internal room of pedestrian walking facilities is classified into the movement room occupied by pedestrians and the no-walking room occupied by obstacles. The width of movement bottleneck is computed through the layout of movement room and obstacle in walking facilities. Second, the pedestrian movement network of walking facilities is constructed based on the partitioning of movement bottleneck to movement room. Pedestrian evacuation tree is transformed from movement network based on the selection strategy of the shortest path in pedestrian evacuation. Finally, the evaluation indicators of spatial characteristics for pedestrian evacuation are established based on the layers and nodes of evacuation tree from four aspects including room size, walking distance, bottleneck width and spatial layout. The method of evaluating the spatial layout of facilities and adjusting the layout of obstacles is obtained. The case shows thhat the layout of the obstacle adjusted and the layout index optimized. Applicability and validity of the index in spatial evacuation characteristics analysis of pedestrian facilities are proved.