This study aimed to develop a conceptual model to use the biomimicry approach in design of building envelopes to improve urban ecology. The research was descriptive-analytical and the required data were provided by library and field studies of buildings designed with biomimicry approach. For this purpose, first, biomimicry approach was identified, then twenty samples of biomimetic envelopes designed by architects around the world were examined and components and criteria were extracted from them. The dependency system of the criteria was measured and the importance of each criterion was determined using a network analysis process with a survey of twenty elites and experts in this field and they were weighted with the help of Super-decisions software. As a result, for functional, physical, and formal components, the relevant criteria and sub-criteria were determined according to their importance. Then, a conceptual model of quality evaluation of building envelopes with biomimicry approach was developed. The novelty of this research is the study of biomimicry approach in Iranian envelopes with nature-oriented design. In this regard, using a quality evaluation model, Barin ski building was evaluated so that according to its strengths and weaknesses, designers can make more effective decisions in design of biomimetic building envelopes in Iran.