In order to get effective assembly path, a space swept algorithm based assembly path planning method to plan the assembly path of aircraft was presented. Firstly, by considering the rules of assembly fixtures and tools in aircraft assembly process, the whole process of assembly path planning for aircraft was formed on base of the assembly sequence. Secondly, the guide model of path planning was developed on the base of assembly sequence which was integrated with the assembly resources. Thirdly, the path obstacle space, space swept closure as well as the assembly path closure were defined, and the path was formed according to the space swept algorithm which can form a swept��volume between the part and its kinetic orientation. Lastly, the parameters of assembly path were studied, and the assembly path was also optimized according to the threshold adjustment of interference. On base of the theoretical analysis, a case of the assembly of a fore flap was studied to prove this method can solve a practical application quit efficiently.