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Abstract: The space resources of tourist attractions are limited, and how to make full use of them and solve the problems in resource allocation is one of the concerns in many disciplines. This study is expected to propose a sustainable development strategy from a designer's perspective that can achieve the full use of the scenic space in a scientific way as well as improve the visitor experience at the same time. Guided by the idea of speculative design, this study analyzes the needs of visitors in a scenic area and interprets the relation between the needs and space so as to develop optimal solutions for the sustainable development of the scenic areas. The open scenic area "Ten Mile Golden Beach" in Haikou, Hainan Province, China, was used as a case study, and the data was collected by means of a questionnaire survey. Using the program SPSS, we conducted an optimal scaling analysis of visitor demand, and the results of the graphical analysis confirmed that there is a contradictory and inclusive relationship between the demands of different visitors. The results of the analysis were interpreted by applying Speculative Design to develop an optimal solution for the sustainable development of the scenic space by way of dividing, merging and guiding demands. The study confirms that: 1. sustainable spatial planning requires full respect of tourists' demands; 2. sustainable spatial planning will alleviate conflicts in scenic areas; 3. planning service spaces according to tourists' demands will improve tourists' experience and promote the sustainable development of tourism spaces. Meanwhile, the results of this study show that: speculative design is an important way of sustainable design; data analysis technology can be a reliable means in visitor demand researches; visitor demand analysis plays an important guiding role and scientific value for the sustainable development of scenic space.

Keywords: Sustainable Development; Scenic Space; Speculative Design; Visitor Demand