Some concepts,such as productivity and productive forces,etc.,have been used mistakenly or inappropriately for a very long time.Through the study on a large number of literature,the paper has made the concepts easy to misunderstand very clear,which include productive forces and productivity,productive forces and productiveness of labor,productiveness of labor and labor productivity,and has analyzed the causes behind it.Finally,the paper has also carried on a probe into the developing orientation of productivity theory and practice in the future.