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Space designers use existing design references for creative inspiration. However, designers' creative processes can be influenced by the representation and the amount of information that the design references contain. In this respect, researchers on design creativity conducted studies to assist designers when utilizing design references. However, previous literature does not consider the connectivity of spaces, even though it is an essential architectural element that defines space circulation. Therefore, it is important to evaluate how designers are affected by the level of details (LoD) of design references when designing spatial connectivity quantitatively. Thus, this paper aims to propose a method for quantitative evaluating the design novelty from an aspect of spatial connectivity. Also, using this method, results of experiment was analyzed the effect of space design reference LoD on the spatial connectivity design. The experiment was conducted with participants majoring in interior architectural design. Similarity of the spatial connectivity between the results and reference was calculated though the graph edit distance. Then the effect of the design reference LoD on the design of the spatial connectivity between the spaces was analyzed based on the calculated results. Using the methodology of creativity evaluation of case-based design proposed in this research, three types of design references was evaluated. As a result, this research clarified the LoD of the design reference that can support the creativity.