In order to achieve the optimum combination of the energy cost for shape recovery and the mechanical performance of composite materials. In this paper， the content of toughening agent Neopentyl Glycol Diglycidyl Ether （NGDE） is increased in the thermotropic epoxy shape memory polymer matrix to reduce its glass transition temperature， and Short Carbon Fiber （SCF） is added to compensate the stiffness reduction caused by toughening agents. The effects of different contents of NGDE and SCF on the shape memory transition temperature， shape memory properties and mechanical performance of the composites were investigated. The results show that increasing the NGDE content can reduce the shape memory transition temperature of the epoxy polymer matrix from 90 ℃ to 43 ℃， and the storage modulus and flexural modulus are synchronously decreased. By adding SCF in the 11%wt NGDE containing sample， the glassy storage modulus， rubbery storage modulus， and flexural modulus of the composites can be increased to 1.9 times， 7 times， and 2.4 times of the original ones.