Adult class refers to people who have entered the society or have the ability to work, and learn sketch because of their love or work needs. For example, in-service workers who study architecture will use hand-drawn sketches in many places at work. In order to improve their painting level, they will go to adult tutorial classes to learn sketch, and what they learn is not very painful and professional. Sketch class refers to professional sketch training, which is specially designed for professional training with the purpose of examination. For example, the professional students in junior high school or the art students in the art test have a weak sketch scene, so it is very necessary to choose a sketch class.