It's relatively complicated for the loads of emergency door surround structure for civil aircraft, which is one important focus of aircraft structure design. The roller guide is the key part on emergency door surround structure, which has been taken as the main research object in this paper. The roller guide has been analyzed from the aspects of function, structure, stress, methods, installation and material, etc. At last, the hole diameter and the profile and position tolerance of serration has been settled ,which is the difficulty of the definition of key geometrical features. Based on above analysis and introduction, the design and its details for the roller guide part has been presented completely.