“Drum Gear Coupling” comprehensively expounds the spatial meshing theory, transmission dynamics characteristics, parameter optimization design, experiment and manufacturing technology of drum gear coupling. In the book, the meshing mechanism and mechanical characteristics of two kinds of drum gear couplings with conjugate tooth surface and non-conjugate tooth surface are studied. The transmission characteristic parameters such as meshing coincidence degree, induced normal curvature of tooth surface, relative sliding rate and lubricating oil film formation angle of drum coupling with conjugate tooth surface are quantitatively analyzed. The drum curve and gear parameter optimization design scheme are put forward. This paper introduces several test methods of drum gear coupling, focusing on the experiments of multi-tooth contact and load distribution between teeth. This paper introduces a simple and practical numerical control technology for processing drum gear with ordinary hobbing machine, which is economical and effective, meets the requirements of domestic drum gear coupling manufacturing at this stage, and has high popularization and application value.