The effect of different curing temperatures on the mechanical properties of flax fiber and their reinforced composites was studied during hot pressing forming process. The results show that the tensile strength of single flax fiber declines in varying degrees when flax fibers are treated for 2h at 120, 140℃ and 180℃, respectively, the tensile strength of epoxy resin E-51 has a little change after treated at the same conditions. Tensile and impact strength change slightly, when unidirectional flax yarn reinforced epoxy resin composites is cured under 120℃ and 140℃. However, when the curing temperature increases to 180℃, owing to the serious damage of flax fiber at high temperature, the tensile and impact strength of the flax fiber reinforced composites then decrease obviously. Meanwhile, as the curing temperature increases, the tensile modulus of composites improves in some degree.
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