From multimedia assisted teaching positioning views, structural dynamics assisted teaching and testing system software is studied. It includes teaching content, review test, paperless examination, virtual interactive computing, animation and picture 5 parts. Teaching method of blackboard as primary and multimedia as assisted is emphasized. Correct application of assisted teaching software is analyzed to solve course assisted learning, virtual experiments, testing and other aspects. Teaching curriculum reform and practical effect of structural dynamics are enhanced. The research can be used to provide teaching reform and practice of mechanics courses.