With more and more people joining the ranks of digital painting, mastering the skills of hand-drawing has become a compulsory course for many people. Da Vinci once said that details determine success or failure. In the operation skills of hand-drawing, details are the key. Are you still worried about the poor hand-drawing skills of the competition? This article will provide you with some practical skills. Skills and methods of hand-drawn operation: 1. Rotate, Enlarge and Reduce and Flip control the canvas. Most people have asymmetric problems. Rotating the canvas horizontally regularly can eliminate asymmetry and visual fatigue. 2. "Pencil" is used to draw drafts and lines. The right side of the four black squares is the hardest and the left side is the softest. 3. "Brush" is mainly used for coloring. People who are not used to color changes can turn off the three items of color matching, water content and color extension. The starting pressure of the brush head is adjustable, and the default value is 50%. 4. Eraser is used to erase mistakes or overdrafts. There is no pressure change in rubber. Wipe it clean with a small eraser. 5. "Layer" is the basic concept of digital painting. It is used in the same way in all software. If it is a line block with a white background, you can put it on it and set the attribute to positive superposition. 6. "Pen layer" is one of the characteristics of SAI. The pen tool in this layer can draw directly like a pencil, allowing you to adjust the anchor point and line thickness. But for long lines, the curve tool works better than the pen tool. Eraser clears all the contents of the current layer selection area. If no selection is made, all contents of the current layer will be cleared. To clean up the draft, use this item instead of pressing the DELETE key or throwing it into the nearby trash can. Brush size: pencil 1 pixel, line drawing 9 pixels, large tone 50 pixels or more, details 20 pixels or less. To sum up, SAI hand-drawing operation needs constant practice and learning. On the basis of mastering basic skills, we can use various tools and functions flexibly to create truly high-level works. It is hoped that the skills and methods provided in this paper can help readers better master the use of SAI hand-drawn software and give full play to its creative potential. At this point, the "Skills and Methods of Hand-painted Operation" is here. Thank you for your patience in reading and studying!