The rapid development of computer information technology has promoted the innovation of translation methods and translation tools, which is reflected in the fact that computer-aided translation technology has been widely used in various translation institutions and companies. In order to ensure the accuracy of computer translation, it is necessary to develop an effective proofreading subsystem. Based on this, this paper analyzes the specific function of computer-aided translation software, introduces the intelligent proofreading method of translation, and discusses the design method of proofreading subsystem of computer-aided translation tools based on Web TM from two aspects: the process of proofreading subsystem and the realization of subsystem error detection, so as to further improve the accuracy of translation results of computer-aided translation tools and reduce the investment of time and human capital.