In rhinoceros, several faces can be combined into a whole without changing the color of the surface. Combine, connect surfaces, merge all faces, or rhinoceros commands. The fusion command is to change the composite surface into a single surface, and the boundary line is simplified. Compared with the JOIN command, although the processed result is the same, the substantive effect is completely different. But also very convenient for the later work after the merger. In this paper, the merging commands are sorted out. In the process of merging, "Edgesaretoofaraparttomerge" and "the distance between the edges to be merged is too large" are often prompted, which leads to the failure of merging two faces, and the corresponding solutions are provided for your reference. The prerequisite for the possibility of fusion is that two faces were originally on the same surface and later split. The two faces are formed in the same way, with the head-to-tail connection above G 1 and ISO corresponding.