Based on the protection rules of Viidumäe Nature Reserve, the main objective of the reserve is to protect the diverse biotic community and the protected species, ecological communities, and habitats in the uplands region of Western Saaremaa.
According to the protection procedure, Viidumäe Nature Reserve is divided into:
- 2 nature reserves (total area of 140.9 ha);
- 16 conservation zones (total area of 2,133.7 ha);
- 3 limited management zones (total area of 158.5 ha).
Restrictions for activities originate from the Nature Conservation Act and the protection rules of Viidumäe Nature Reserve. The basis of planning work and activities is the managing document of the reserve – Management Plan of Viidumäe Nature Reserve 2015–2024.