Abstract: The major lingual and mental blocks observed in the bilingual teaching of International Laws are as follows: psychological shadow, cognitive bias, mental inertia and learning disability. The teacher is expected to have a better mastery of the switch time of English and Chinese so as to guide the students out of their psychological shadow; enhance students' understanding of the bilingual teaching to correct their cognitive bias; the cultivation of the right learning methods and thinking pattern to rid them of the negative effects from their psychological inertia; the reinforcement of the students' linguistic competence to improve their ability to use a language.