It is revealed the opportunity and expediency of usage of the biogeocenology approach to the research of structural-functional organization of landscape parks on the example of the ancient landscape park Trostyanets. The quantitative correlation relations between codominant components of the park dendrocenosis are detected by using the principle of the parcelling analysis. The features of the structural-functional organization of the park ecosystem of Trostyanets version, in particular, the type of the system self-regulation are discussed. The prediction estimation of the condition of the park dendrocenosis are carried out.