This book is Chinese version of geometric design for a patchwork quilter. The contents explain that the possibility and diversity of geometric design can be greatly increased by performing simple geometric operation of dividing polygon internally, and introduce geometric design using them. This book is a newly written content in addition to reflections and notices after the serialization of the contents that were serialized in the Japanese magazine "Quilt Japan" from the spring issue of 2018. In addition, most designs of quilts are newly created after serialization. I think that it will be good a reference for the patchwork quilter who are considering the original design. Please take advantage of this book.