The area of study is the Croatian Littoral, in which was covered the entire areal of pine forests: the northern part from Rijeka to Novi Vinodolski, the central part from Novi Vinodolski to Senj and the southern part from Senj to Karlobag. The study included old stands of black pine, over 80 years old. The stands of black pine are divided according to three criteria: origin, vegetation zone and degree of canopy. According to their origin and vegetation zone they are grouped as follows: 1. natural stands inthe epi-Mediterranean vegetation zone, 2. artificial stands or monocultures in the epi-Mediterranean vegetation zone, 3. artificial stands or monocultures in the sub-Mediterranean vegetation zone. Depending on the degree of canopy, the following localities in the stands were selected: dense canopy, incomplete canopy and edge of the stand. Natural stands are created by natural regeneration. Artificial stands or monocultures were created in the late 19th and early 20th centuries, by afforestation of uncovered forest lands and filling in uncovered parts of protected degraded stands. The aim of the study was to establish in the investigated old stands of black pine: structure, vitality and sylvidinamics; environmental conditions; undergrowth structure; the structure, quality and development of the young growth; the influence of light on the structure and development of the young growth; a way to regenerate stands. The study was performed on39 experimental plots. Onetransect and 6 - 18plates were placed on each experimental plot. The structure of stands was investigated on the experimental plots. The undergrowth structure was investigated in the transects. The structure of the young growth was investigated on the plates. All hypotheses were confirmed: H1. Black pine is a species of tree suitable for afforestation considering the ecological conditions of the study area; H2. Black pine provides progressive silvidynamics; H3. Old stands have a transitional sylvidinamic character; H4. Light conditions in the stand significantly affect the density and development of the young growth of climatogenic species of trees; H5. Natural regeneration of stands can be achieved using shelterwood method.