The aim of this paper is to clarify the spatial composition rule of boundary space in the classical gardens of Suzhou, China. By analyzing the component (boundary wall, affiliated elements, landscape elements) and the split 137 abstract diagrams, the following three points are revealed: a) The most commonly used affiliated elements is the linear element, the most commonly used space type is paste (p). b) There are large amount of miniature courtyards(xs) and side courtyard(s) included in the boundary space where the scale are S type and M type. c) Most boundary spaces have tree and stone as landscape elements.
