Abstract: UHMWPE fibers were treated by chromic acid oxidation and pyrrole vapor deposition respectively.The interfacial shear strength of the fiber/epoxy resin system was tested,and then calculated by finite element method.The calculated interfacial shear strength was compared with the experimental value.The results show that the calculated interfacial shear strength of chromic acid treated UHMWPE fibers/epoxy resin system revealed a better agreement with the experimental value,and slightly higher than the experimental value.Increasing pyrrole vapor deposition polymerization time,the calculated interfacial shear strength approached the experimental value.When pyrrole process was 1 h,the calculated value was nearest to the experimental value.