Not only for those who love mathematics, but also for those readers who haven't found many charms in mathematics. This book is especially written for those who have only studied geometry at school (or are studying geometry now), so they are not used to paying attention to the established geometric relationship of various things around us and will not apply the geometry knowledge they have learned to practical aspects. When they encounter difficulties in life, when marching or camping, they don't know how to apply the geometry knowledge they have learned. Arousing the reader's interest in geometry, or according to the author, "arousing the desire to study it and cultivating the interest in studying it are the main tasks of this book." To this end, the author "leads geometry from the wall of the school classroom to the outdoors, to the woods, to Yuan Ye, to the river, to the road, so that we can do geometry homework freely in the open air, without textbooks and function tables ...", attracting readers' attention to the pages of lev tolstoy, Chekhov, jules verne and Mark Twain, and finding out the materials of geometry problems from the works of Nikolai Gogol and Pu Xiquan. This book inspires and guides readers to learn the basic knowledge of geometry through many fascinating topics, such as the measurement of distance, area and orientation that people often encounter in the vast Yuan Ye (Woods, roads, rivers and islands), and similar problems extracted from some famous literary works. The content includes the application of many set theorems in plane geometry in middle school.