The line graphs have been widely used in scientific papers. Good line graphs can display complex data in front of the readers with an intuitive, concise and clear way. The graphs would help readers to read and obtain information, and more helpful to express the author's ideas. This is conducive to the dissemination of scientific and technological information. Taking the problems using the line graphs as examples, the paper introduces several optimization methods of line graphs in scientific papers. Based on years of experience in graphs editing and processing, the authors of the paper provides optimized examples of scientific and technological papers through graph type selection，adjustment of horizontal and vertical coordinates and legend, merge and split of graphs, graph conversion, code application, etc. This paper provides information and methods for the rational editing of scientific papers. Through the optimization of the line graphs, the author ’s ideas and scientific research results can be accurately expressed. Moreover，it effectively promotes the rapid dissemination of scientific and technological achievements.