[Objective] This paper aimed to provide some bases for inner lake landscape planning, low impact development and the protection of such regional landscape through quantitative research of sustainable development way in the process of landscape resource development.[Methods] We chose the Xishan Island and the surrounding lake areas in Taihu Lake as the typical research area. RS & GIS spatial analysis technology and method was used to provide quantitative analysis referring to road landscape, lake view, visual opening degree, visual richness and terrain factors.[Results] Firstly, 30 proposed locations were screened out with respect to indicators as slope gradient, the size of the platform foundation, flood, low impact development and the limited reach of the road landscape. Secondly, the final locations were identified through the analysis of viewing area, waterscape openness and visual richness.[Conclusion] Visual resources development based on quantitative date is a measure of source control. The location of viewing platform is reasonable and valid for visual resources sustainable utilization and regional ecology.