The localization of shield is of great necessity for China. In this paper, thestateoftheart of the development of the main drive reducers of shield in China and abroad is presented, and study is made on the localization of the main drive reducers of shield in China. The fault phenomenon of the main drive reducers of LOVAT 246 shield is summarized and analyzed, and study is made on the localization of the reducers in terms of material selection, gear modulus and dimension selection and bearing optimization. The trial of the prototype shield with the developed reducers proves that the reducers developed can meet the requirements of the normal shield tunneling completely. The study on the localization of the main drive reducers of shield has great significance in improving the shield technology.