Key Features: 1)1600 confusing synonyms in 725 pairs selected from the daily communication of overseas students; 2)Each pair consisting of three modules as Similarity and Difference, Example Sentences and Exercises; 3)Analysing similarities and differences of synonyms in multi-dimensions by listing explanations, usage, tincture and grammatical functions; 4)Providing the same and different word collocations most frequently used; 5)Each pair including 10 questions for learners to test proficiency by themselves.