Abstract: A text is constrained by its situational context. Through the analysis of some constraining factors like field, tenor and mode, one can exactly understand the meaning function and communicative purpose of a given text. The introduction of constraining factors of text in the teaching of Chinese-English translation can help students have effective and quick understanding of the original text, and produce a version which can express the meaning and communicative functions of the original text. The employment of dynamic teaching concept in class teaching is a great help to stimulate students’ enthusiasm in study and improve their learning effect.