In this paper, we investigate the global existence and Plastic Cups and Plates large time behavior of entropy solutions to one-dimensional unipolar hydrodynamic model for semiconductors in the form of Euler-Possion equations with time and spacedependent damping in a bounded interval.Firstly, we prove the existence of entropy solutions through vanishing viscosity method and compensated compactness framework.Based on the uniform estimates of density, we Stuffy Patch then prove the entropy solutions converge to the corresponding unique stationary solution exponentially with time.We generalize the existing results to the variable coefficient damping case.