Abstrack:
Dieng Plateau is a leading tourist spot in Central Java, only the second place to Borobudur Temple. It is situated between two regencies, Banjarnegara and Wonosobo. Municipal governments of these regencies have already issued a policy on area spatial management plan, which governs a conservation of protected area functions. The legal statement of this plan is written down on the Municipal Government Act No. 11/2011-2031. This research applied a qualitative method in order to answer questions of the implementation of the policy on protected forest conservation in Dieng Plateau. Informants used for this research were collected by a purposive sampling technique. The research found phenomena dealing with the implementation and factors that inhibited the policy of the protected area conservation in Dieng Plateau. The policy has a purpose of restoring protective functions as nature should play its role. The policy involves concerned actors, such as Bappeda, Dinas Kehutanan dan Perkebunan, Dinas Pertanian, Badan Lingkungan Hidup, community leaders, and local farmers in Dieng area. The implementation communicated by each of these institutions has not been optimal because of sectoral egoism, lacking participation of local people, and lacking regulations that govern the protected area conservation. Parts of the area are still possessed by individuals and some local people are reluctant to a change in atttude towards excessive potato plantation, despite the plantation belongs to themselves. The research recommends legal assurance, which governs protected area conservation in individually-owned areas and an appropriate program that relocates the potato plantation without diminishing economic income of the farmers.