Abstract: In order to assist enterprises in making reasonable decisions during the evaluation stage of product design
schemes and reducing blind subjectivity of design, a decision-making model for selecting industrial product design
schemes was constructed based on the multi-level grey comprehensive evaluation method. In the evaluation process,
firstly, the weight coefficient of the evaluation index was reasonably determined through qualitative and quantitative
analysis according to the analytic hierarchy process (AHP) and entropy method. Secondly, the gray correlation analysis method was adopted to calculate the gray weighted correlation degree of each design plan, the order of the
design schemes was determined, and the comprehensive evaluation and selection of the design schemes were
completed based on the results. Based on this model, the priority ranking of five design schemes of a certain
multi-rotor UAV was completed, and the results were verified according to the entropy weight TOPSIS method,
proving the feasibility of this model. Finally, based on the index weights and program scores, the optimization of the
selected scheme was conducted, and the scheme was visualized by three-dimensional modeling. Thus, the role in
design assistance of the decision-making model for evaluating and selecting UAV products, based on the multi-level
gray comprehensive evaluation method, was effectively demonstrated.

Key words:  scheme selection, design decision, gray correlation method, entropy method, analytic hierarchy process;
industrial design