The purpose of this study was to develop a new crop simulation model that simulated the crop biomass and yield of winter wheat from accumulated thermal units and simple partitioning rules under the different water and weather conditions in Bavaria, by using the least required input data from the users, which permits a large section of users to use the model. Therefore, the simulated crop model was designed to be used not only at the research sector, but also at the educational and applied sectors. The developed model estimated also the winter wheat yield under the expected future weather conditions, by using the weather models REMO, CLM and STARII, for estimating the expected crop behavior and distribution of winter wheat till 2100.