The studies on the formulation and curing behaviors of Kevlar/Epoxy prepreg for NOSE CONE of aircraft were presented in this paper. Dielectrometer and differential scanning calorimeter were used in order to check the curing behaviors. This prepreg showed the lowest ionic viscosity around $120^{circ}C$, and then the ionic viscosity was gradually increased up to $200^{circ}C$. This indicated that the curing reaction of this prepreg started at $120^{circ}C$ and the molecular weight was increased by the accelerated thermal cross-linking reaction. The loss factor and tan $delta$ values were also measured and discussed. The loss factor behaviors of Kevlar/Epoxy prepreg, which is related to the fluidity of matrix, were fecund to be similar with that of ionic viscosity. The thermal reaction properties of this prepreg were also studied by differential scanning calorimeter.