This research is about the Vector content and concepts, a topic in high school math curriculum. Author has been teaching in high school for many years, and found out students easily have misunderstanding in this topic. Therefore, this research based on textbooks of many publishers and author 's teaching experience aims to help clarify the misunderstanding for students' learning. It is known that the concept of Vector is very crucial for future use, especially for students who will be major in Science and Technology. Hope this research can help students clearly understand Vector.