Abstract: Surface treatment process is one of the most important conditions for preparing high-performance carbon fibers. This article studies the influence of the interlaminar shear strength and cross section and level morphology of carbon fiber/resin composites under different surface treatment process of PAN-based carbon fiber. We tested the tensile strength of carbon fibers and the interlaminar shear strength of its composites. We also analyze and evaluate the influence of different surface production processes on ILSS of carbon fiber/resin composites by SEM. The results show that, the electric conductivity of 12 ms/cm is a better choice in surface treatment technology, interlaminar shear strength is 81.2 MPa of composite materials and the ratio of tensile strength is 1.02% between un-surface treatment and surface treatment carbon fiber. The changes between interlaminar shear strength and electricity of high-performance dry jet wet spinning carbon fibers are conformed to the "layer enter type materialized double model". The better choice of electrolyte is NaOH, the better choice of concentration is 2%, and the better choice of electricity is 10 C/g when preparing high-interlaminar shear strength carbon fiber and composite materials. The level morphology between SYT49 carbon fiber composite materials and T700G are the same under the surface treatment process.

Key words: surface treatment, electrical conductivity, tensile strength, interlaminar shear strength, interface morphology, carbon fiber, composite