Study on the grey incidence of interval number

The distance of interval number and its characteristics were defined in this paper first, then based on the theories on the degree of grey incidence, namely, the more similar the curves are, the higher degree of incidence between sequences, we defined the incidence degree of interval number and discussed its characteristics. All this extended the degree of grey incidence from real number sequence to interval number sequence and widened the theories on degree of grey incidence. At the same time, not only did the grey incidence of interval number extended the applied fields, but also provided the theory basis for applying grey incidence analysis method.