The energy deposition for electron beam with low energy on Si specimens was calculated by Monter-Carlo method.Making use of electron paramagnetic resonance(EPR) technique,the investigation of the effects of EPR signal variations in dopant type and concentration was carried out by using P-type and N-type(111) silicon wafers with concentrations of 1×10~15cm~-3 and 1×10~17cm~-3,respectively,before and after the irradiation of electrons,and the intensities of defect paramagnetic centers before and after irradia...