The elevator is a common vertical transportation in our life. The elevator door system includes a door driven system, a door coupling, a door safety, and two door locks. The purpose of this work is to develop a systematic methodology for the design of the elevator door system. First, basic characteristics of the elevator door system are deduced, and all possible variants of function structures are synthesized by functional analysis method. Next, a system of kinematic notation is used to generate the principle solutions of each function in the function structure. Finally, all design concept variant can be created by using morphological chart method. Several design concept can be created for new elevator door system.