The rule of subordination is one of the most important philosophical rules. Davani presents his special analysis about this rule. We should present his analysis in all his texts. Davani s theory of predication is conceptual difference and existential identity. He develops the identity. With this development Davani presents a new attribution theory. The rule of subordination consists of three parts: the existence of subject, the existence of predicate and the existence of subject before the existence of predicate. In Davani s opinion the existence of subject is essential but the existence of predicate is not essential and the existence of subject before the existence of predicate is not essential too.