Overall protection has always been an essential principle of the protection of cultural heritage. The research on the protection of gifts and its setting is just the contents of the preventive conservation of immovable cultural relics. However, the current protection of garden heritage settings only stays on the stage of planning and regulation. Thus, it is difficult to effectively protect and manage cultural heritage, let alone the preventive conservation of heritage. This paper uses methods of literature review, field investigation, and the instrument of surveying and mapping. It takes the world cultural heritage the Master-of-Nets Garden as an example, sorts out its integrity protection characteristics and the insufficiencies, discusses the spatial relationship, historical origin, and cultural connotation between the Master-of-Nets Garden and the surrounding alley environment consequently puts forward the “Garden, House and Alley” integrated protection concept and relevant measures of the Master of Nets Garden based on the principle for the overall protection of cultural heritage and preventive conservation connotation of garden heritage.