The object of logic study is the specialized form of thinking instead of the generalized form of thinking,that is,formation of thinking.As far as the traditional logic is concerned,the specialized form of thinking results from substituting the conception variables or propositional variables for the concrete conceptions or propositions in the formation of thinking.Logical thought is a speculation on the formation of thinking,which is merely an intermediary from the logical thinking to the logical system.What the so-called Ming-bian "logic" witnesses is not that there was any logical system in ancient China,but that there was some logical thought in ancient China.