The effect of Nd on high temperature creep properties of Al2O3f/AZ91D and the effect of compressive stress on creep stress exponent were analyzed. The results show that the creep resistance of Al2O3f/AZ91D composite is significantly improved by Nd addition, and Al2O3f/AZ91D with 0.8% Nd has the best creep resistance. When the stress is in the range of 60-90 MPa and 156-180 MPa, the creep mechanism is the load transfer between the matrix and the reinforcement, and the composite failure mechanism is the cracking and breaking of fibers. When the stress is in the range of 90-156 MPa, the creep mechanism is viscous glide of dislocation and climb of dislocation.