To research the shaping methods and forms of book multidimensional space， providing ideas and reference for the later development of modern book design.It analyzed the form shaping and expression of book multidimensional space， the composition and performance of external and internal space， demonstrated the external space can be made by design of book shape and fore edge， the internal space can be got by means of folding， cutting， architecture.The designer should take into account the functionality of books and the feelings of readers. The research of book multidimensional space form is a new perspective to the modern book design.