Tensile fracture behavior of directional PMMA at different temperature is investigated.And the relationship between tensile behavior and temperature is discussed.The result shows with the temperature increasing,tensile strength and modulus decreases but elongation increase and material properties change from rigidity to flexibility.Fracture characteristics of directional PMMA are obviously different at different temperature.Fracture faces exhibit delamination features at 23℃,fireworks features at -55℃ and flexibility features at 80℃.