The essence of multiple attribute decision making is to use the present decision-making information to sort
analyze, rank and evaluate the alternatives, so as to find out the easiest and correct way to rank. For the multiple
attribute decision making problem of attribute value within interval number, transformation methods for interval number
into connection number is proposed. Then, the connection number is used as possibility degree formula for those numbers
between two interval numbers. And the magnitude of interval number is tested for decision making advantage matrix
according to its possibility degree. Finally, examples of voting problem show that this ranking method is logical and feasible.