Notable Problems of Grey Relational Calculation Process and Axiom System

This paper discusses that initializing unity or zero elements is not suitable for original sequences in calculation of Deng's relational grade and all close correlations. Meanwhile, examples clarifies that existing relational grade have the symmetric point, such as Deng's relational grade, new model relational grade, complex relational grade and matrix relational grade. Namely that integrity excludes the symmetric point is improper in grey relational axioms.