In order to implement the on-orbit services effectually, introduce axiomatization design into the design for on-orbit assemble spacecraft, give a design method based on function requirements. Based on the well-known about the requirement of the assemble service, and then define the works to solve the problems laid on them. The requirements were transformed into solution by analyzing, and design the manufacturing process. The design example shows that it provides a new method for designing on-orbit assemble spacecraft.