Abstract: The cure kinetics of phenol modifying cyanate ester resin system were investigated by non-isothemal DSC. The results show the organic titanium catalyst could reduce the active energy of resin. Thus, the reaction temperature could be reduced and cure reaction rate could be accelerated remarkably. The cure of modified cyanate ester resin was almost a first-order reaction. The organic titanium catalyst could not change the reaction mechanism of these resin system.