In the study Xi of sketching, "knowing the law" is not the same as "obtaining the law", and to obtain the "law" must go through repeated and arduous practice, and must go through the straining of one's muscles and bones, hurting one's body and skin, and racking one's brains before one can realize it, and it is difficult to get anything without hardship. "Those who seek benevolence will be benevolent, and those who seek art may not necessarily get art", learning art depends on feeling, understanding, talent, aura, extensive knowledge and artistic accomplishment, especially on the solid basic skills obtained through long-term hard training. Drawing, as the foundation of the plastic arts, influenced the development of painting, sculpture and other forms of painting. More than 2,000 years ago, China has produced black and white painting as the main form of expression, and white drawing and ink painting have become the basic means of sketching in traditional Chinese painting. As Western anatomy and perspective were revealed in the field of fine arts, the Renaissance in Europe in the fifteenth century gave birth to a group of masters who pushed the art of drawing to new heights. 
Rigor and rigor must be advocated when students learn Xi painting, especially in the initial stage of learning Xi. Without long-term, rigorous training, rigorous realistic skills, and a lack of the spirit of hard study, learning Xi will not succeed. Due to the students' lack of understanding of the regularity in the Xi of painting, there are many blind spots and blindness, and the academic Xi grades are stagnant. Due to the lack of understanding of the profundity of the study of painting and the lack of arduous mental preparation, it is easy to produce impatience and boredom, and lose confidence in the Xi of learning. 
Drawing is the foundation of the plastic arts. Sketch is a general term for monochrome painting in a broad sense. It is a painting that uses a color to express the form, structure, tone, light and shade, space, position, texture, volume, rhythm and connotation of all things in the universe on a flat paper or canvas. It can be said that sketching is a special means for us to understand life and nature, and it can also express life and nature very creatively, so as to sublimate it into art. Behind this sketch art, it can be said that there is an independent and systematic art world of science, aesthetics, philosophy, psychology, etc. It has its own modeling language, its own structural laws, its own strength and connotation. This is exactly what we learn to Xi to sketch for. 