In this study a process oriented model of the JABOWA tree growth model was verified to simulate and to predict tree growth in hypothetical climate resulting from global climate change scenarios. Based on literature, four treatments were applied, normal temperature, and increases of 1,3 and Sac. First JABOWA was calibrated for Norway spruce (JJicea abies (L.) Karst) and Red pine (Pinus resinosa Ait.) using the weather data from 1953 to 1992. Comparison of basal area increment of both species for last (1983-1992) and the next (1993-2002) ten years showed that there were no significant differences when temperatur was normal or increased by Jl and 3 °c but it was significant (P
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