Grey incidence analysis, one content of grey system theory, has been widely applied in many fields and gotten a lot of beneficial results. The fundamental idea of grey incidence analysis is that the closeness of the relationship is judged based on the similarity level of the geometric patterns of sequence curves. The more similar the curves are, the higher the degree of incidence between sequences, and vice versa. This paper presents a new method of calculating degree of grey incidence with some principle of Gini coefficient. Finally, we use Gini degree of grey incidence to study the relations between economic growth rate and three industries growth rates of the cities in Central Henan Urban Agglomeration.
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