On Dec 20, 2016, Mr Yang gave a lecture in Zhengzhou, Henan Province. This lecture included five parts: Part I introduced patent right and patent system. Part II introduced patent licensing procedures, especially preliminary examination procedure, substantive examination procedure, and reexamination procedure. Part III introduced patent right affirmation. Part IV introduced patent infringement judging principle and defense causes based on specific cases. Part V introduced content relating to patent infringement avoidance.