Beijing's “three cultural belts” (the Grand Canal Cultural Belt, the Great Wall Cultural Belt and the Yongding River Cultural Belt in Western Hills) were written into the 13th Five-Year Plan Outline of Beijing in 2016, implemented in 2017, and formally included into the new edition of the General Urban Planning of Beijing as an important part of the protection system of its famous historical and cultural sites. Among the three cultural belts, the Yongding River Cultural Celt in Western Hills contains the most diverse cultural elements. According to preliminary statistics, the Yongding River Cultural Belt in Western Hills includes more than 400 cultural relics which are included in the protection list of municipal, national, and world cultural heritages, also known as the source of Beijing's civilization, the root of history and the soul of culture. On Western Hills: Cultural Kaleidoscope, one of books describing the “three cultural belts”, is divided into seven chapters, which introduces the outstanding characteristics and historical and cultural deposits of the Cultural Belt in Western Hills from multiple angles and in an all-round way. This book, covering three hills and five gardens, archaeological sites, temples, celebrity relics, inscriptions on precipices, ancient villages and local specialties, is rigorous in structure and plain in language. Informative, readable and interesting, the book provides a reliable text for readers to understand the Cultural Belt in Western Hills and even the historical and cultural background of Beijing as an ancient capital lasting for thousands of years.