This paper introduced the situations of the bilingual teaching with full English in fluid mechanics course undertaken by foreign teacher in Beijing Jiaotong University, discussed some questions, such as basic ideas, teaching methods, teaching effect assessment and evaluation in bilingual teaching, and analyzed the problems that should be paid attention to. The teaching practice shows that the teacher is the key in bilingual teaching, the full English bilingual teaching can not only make students achieve desired professional knowledge, but also help them to know the way of thinking, description and representation methods in professional knowledge with English, and improve their abilities of communication with English.