In this research we discuss the design methodology that can support biomimetic design in engineering design process. The bio-mimicking approaches have made progress in supporting solutions for complex engineering design problems. Practically by applying bio-models ? which were self-optimized under their environment ? in design problems, engineers can reveal the design solutions and be possible to expect surmounting preexistence limits. Basically, the biomimetic design approach of this paper focused on morphologically developing a low aerodynamic drag train model.