he completion methods of oil and gas wells are an important part of completion technology, we have built a DBMS of well completion; and, based on it, the CMES and fuzzy evaluation systems are built to optimize the completion method, and a great progress has been made in the study of well completion. With this two systems, we optimized the completion method of the deep exploratory wells in Xinjiang area. It plays a positive role in the exploration and develop ment of oil and gas reservoirs in Xinjiang.