Inspired by the coupling phenomenon in biological system,the biomimetic units coupling the structure and the concave morphology were fabricated by laser remelting.The effects of laser processing parameters on the structural and morphological dimension of biomimetic units were investigated and discussed.Optical microscope and three-dimensional confocal scanning laser microscope were used to investigate the structural characteristic and surface morphology of biomimetic units.The results indicated that the biomimetic coupling units with the big structural and morphological size can be obtained by laser processing with twice suitable laser parameters.Under the action of single laser processing,the electrical current is predominantly significant factor for not only the diameter but also the penetration depth of biomimetic unit.Both electrical current and pulse duration have considerable effects on the formation of concave.The formation mechanism of corresponding biomimetic coupling units was discussed.