The Key-Elements Intelligent Civil Trial Assistance System was developed by courts in Sichuan Province by relying on the unified civil trial database of three levels of courts in the province，exploring in a deep-going way judicial big data，and integrating AI technologies. This system，as the result of the exploration in intelligent trial by courts in Sichuan Province，has greatly raised trial efficiency and provided judges with whole-process intelligent assistance in the trial of cases. Before the trial of a case，the system automatically identifies and analyzes the claims of the parties to the case and the key elements of the case. In the process of court trial，it automatically generates outline of the trial on the basis of the table of key elements，and helps the judge to give trial guidance，thus reducing the recording work of court clerks；after the court trial，it intelligently generates judgment，thus reducing the paper work of the judge. The application of this system has solved the problem of heavy caseload and lack of staff faced by courts in Sichuan Province，solidified and popularized the trial experience of an excellent contingent of professional judges，and promoted the unification of the criteria of trial.