Abstract: [Objective] To comprehensively assess the quality of the traditional Chinese medicinal materials of Euonymus alatus from different habitats by grey correlation degree and grey-clustering system analysis method. [Methods] Using the main active components of Euonymus alatus, including catechin, dehydrocatechins A, aromadendrin and naringenin as assessing index, the quality of the crude materials of Euonymus alatus from nine different habitats was analyzed by grey metrology method. [Results]The evaluation results of this study were basically consistent with the actual situation. [Conclusion] Compared to the traditional main component analysis method, grey metrology method has the features of simplicity and wider application scope.