The patch curing behavior of fiber reinforced composite structures during scarf repair was studied via finite element simulation. A patch curing model of scarf repaired composite structures was established based on the temperature-dependent material parameters. The effect of heating rate and hold time on the temperature field in scarf repair was discussed. The results show that the influence of heating rate on the curing behavior of scarf repair is greater than that of hold time. When the heating rate increased one time， the curing temperature peak of the center increases by 1.1%. Moreover， the temperature change rate and curing reaction rate increase as the heating rate increases with an obvious temperature gradient generated in the curing area. In this work， the maximum temperature difference in the repaired area is up to 8℃.