Abstract:

 On the basis of the basic concepts of active voice and passive voice of verbs, the characteristics of dynamic verbs in passive voice structure is described emphatically through practical examples from English Sci-tech papers.some correct forms of passive voice which are often easy to be mistaken are introduced, and some suggestions for using active voice and passive voice exactly are put forward in polishing written language of scitech papers.

Key words: English sci-tech papers, polishing written Language, characteristics of voice, active voice, passive voice