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Based on the characteristics of huge and heavy aircraft blocks merging technology, the application of multi-robot coordination in a merging system for posture alignment is studied. Focusing on the fundamental theories and key technologies of multi-robot coordination system, the system architecture of multiple 3-DOF mobile robots, organization and posture coordinated manipulation method are proposed. By virtue of the blocks merging technology, the blocks' kinematic model is expressed as a body moving with limited linear displacement and rotating with small angular displacement. The coordinates transformation between basic block, merging block and single robot is achieved on the basis of large subassembly merging technology. The trajectory planning method of posture aligning by means of Denavit-Hartenberg method is presented. The proposed method incorporates the behavior of robots and experiences of aircraft blocks mergence into multi-robot coordination.