The aim of this thesis was to analyse the annual growth response after thinning in pure spruce stands and spruce stands with intermingled larch. Therefore 46 stands, which were thinned during the past 20 years, and 12 un-thinned stands were measured by one angle count each. Thinning intensity was estimated by measuring the stumps. For every sample, increment cores were drilled from three spruce trees and one larch tree and the year rings were used to reconstruct the basal area growth after thinning. A Weibull function was adopted for each sample to estimate the diameter of the remaining trees. On average, a measurable increment in growth of the single trees occurred starting from the third year after thinning and had a maximum response in the 7th year with an increment of 50 percent compared to pre-thinned growth. Larch reacted sooner but less pronounced. When the results of the growth response per stand were compared to the growth model PROGNAUS (Sterba et al, 1995), the model overestimated the growth in the first 5-year period. Using the tree ring data, a model was calculated, to partition the 5-year basal area increment after thinning on the increment in the single years. Growth in the first year after thinning was significantly lower, while in the 4th year it was significantly higher than in the un-thinned stands.