Abstract: This Paper discuss the effect of a uniform static magnetic field on cross-linking of an cpoxy Novolac cured with 2,4,6-tri (dimethylaminomethyl) phenol (DMP-30). The cross-linking reaction was canied out at 130-190℃. The change of ether bond linked network formed in structure was monitored by the determination of specific resistivity qualitatively. Results shewed that the magnetic field effect can promote the cross-linking reaction. It was verified by the FT-IR spectra analysis and observation under SEM. The improvement in cross-linked network led to an enhancement of resistivity on one to two orders of magnitude higher than of the control sample and increase in glass transition temperature.