Abstract: The carbon fiber reinforced polylactic acid (CF/PLA) composites were specially prepared, with carbon fiber treated by nitric acid oxidation. The effect of pulsed electromagnetic fields (PEF) on the CF/PLA composite degradation characteristics under that treating condition was explored. The results show that, carbon fiber surface treatment has influences on the water absorption of CF/PLA composites mass retention, bending strength and shearing strength varying degrees under the PEF action. The analysis combined with the previous studies shows that the ester bonding formed by the carbon fiber surface treatment has existence of a sort of change under the role of PEF, which leads to specificity of the interface degradation of CF/PLA. The study is expected to provide a solution of synergistic control from the material itself and the external conditions degradable to improve CF/PLA internal fracture fixation device.