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A whole analysis model inclu ding forging and flat platens is built,which is used to analyse the process of upsetting a cylinder between flat platens.The influence of surface friction and t ransient temperature are comprehensively considered.By means of ANSYS software,the elasto-plastic FEM analysis of the whole upsetting process is carried out.From the point of view of numerical calculation,the correctness of the centre region tensi on stress theory about upsetting a cylinder between flat platens is tested and verified.The concept of plasto-nucleus is presented to explain the forming of double dumps.The efffect of temperature is inspected.The relation curves between the radial stress of the symmetry centre point and the relative pression ratio are given.