Chinese and foreign academia have made important stage achievements of research on the Chongqing Big Bombing. However, the research findings are very far different.The reason of course are the limitations of research data,and the difference of research perspective and ways, but more important,are that the scope of fundamental issues of the “Chongqing Big Bombing” have not been seriously defined. To this end,based on historical archives, take defining the concept of "Chongqing Big Bombing" as the core,the author puts forward some new valuable insights about the division of stage of the Chongqing Big Bombing,the damage caused by the Chongqing Big Bombing and its characteristics,the impact of the Chongqing Big Bombing, as well as the significance of the research on the Chongqing Big Bombing.