This study has been conducted to assess the possible impacts of climate change on crop water an dirrigation requirement of the eastern Dez Plain in south-west of Iran, according to the current crop pattern, and for the 2020s, 2050s and 2080s periods. The climate change data was generated for A2 scenario through the global circulation model HADCM3, using the stochastic weather generatorLars-WG model. The results showed that crop water requirement was predicted to increase from themean value of 653.5 [mm year–1] in the baseline period to 663.15, 682.3 and 715.0 [mm year–1] in the 2020s, 2050s and 2080s, respectively. Irrigation requirement was estimated to decrease by 2% in the 2020s and increase by 2.7% and 15% in the 2050s and 2080s periods, respectively