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The deformation behavior of as-sintered CNTs/Al-4Cu composite was investigated by isothermal compression tests,which were performed among temperature range of 300-550℃ and strain rate range of 0.001-10 S-1 with Gleeble-3500 thermal simulator system,and the height reduction was 60％.The flow stress-strain curves and the processing maps at strain of 0.1-0.6 were used to characterize the deformation behavior of as-sintered CNTs/A1-4Cu composite,the microstructures of the deformed specimens were also observed in this paper.The results show that the flow stress increases with the strain rate at a setting deformation temperature and decreases with temperature at a setting strain rate,the flow strain increases rapidly with the increase of the strain due to dislocation generation.The strain does have a little influence on the processing maps,the optimum processing domain is the temperature range of 630 K-660K and the strain rate range of 0.03-0.3 S-1,and the peak efficiency of power dissipation at a strain of 0.5 is about 33％.