The present research is to study the feasibility of integrating formal logic training into Business English Speaking courses. By demonstrating students’common violation of four basic principles in formal logic: Law of Identity

Law of Excluded Middle

Law of Contradiction and Law of Sufficient Reason

this paper suggests that teachers should include the basic knowledge of formal logic into the courses

demonstrate the whole logic process in business dialogue and meticulously design tasks involving logical thinking

so as to increase the certainty

clarity and consistency in students’ business language.