The line drawing can be said to be the first step of drawing. For illustrators, many times they need to create illustrations based on line drawings. At the same time, line drawing is also a way of expressing life. In our daily life, we can not only use the line drawing to record the drops in our life, but also use the line drawing to put some of our wild ideas on the paper. This book is a full practical type of illustration line drawing instruction book. The book covers five areas: plants, animals, food, objects and people, and shows the process of drawing 100 line drawings. Each case is analyzed and explained step by step in an easy-to-understand manner, and is also divided and arranged in detail according to the level of difficulty. In addition, in order to give readers an all-round understanding and learning of line drawing, the book summarizes some basic knowledge of line drawing and shares it in the form of an appendix. This book is suitable for both zero and weak drawing students, as well as for some painters who need to do basic practice for later coloring.