Shape-Memory Polymer (SMP) is being investigated for practical use as deployable space structures, such as large antennas and long booms. Since SMP is a polymeric material, it does not have enough strength and stiffness when it is used for a structure. In order to improve the strength and stiffness of SMP, reinforcement with carbon fibers is under consideration. Fiber reinforcement increases the stiffness of SMP, but it also decreases shape recovery property. In previous research we studied thermo-mechanical behavior of SMP reinforced with short carbon fibers through thermo-mechanical cycle experiment. We also measured strain distribution in a specimen to clarify the mechanism how degradation of shape recovery property occurs. We found strain concentration in the vicinity of fiber ends. It increases irrecoverable strain around the fiber ends, resulting in a degradation of shape recovery property of the whole SMP-composites. In order to design functional SMP-composite, we studied further information on effect of the microstructure. We carried out finite element analysis, changing proportion, distribution and aspect ratio of carbon fibers. We also made creep experiment and measured residual strain within SMP-composite after shape recovery. In this experiment, we clarified the relation between creep strain and residual strain, which is important to understand the degradation of shape recovery property.