Abstract: With the entity of global economy, social reform and the development of English education, English test has already become an focusing part in higher education. Because of the important status of English and exam scale, Computer Assisted Testing (CAT) undoubtedly is an convenient and rapid way. However, ordinary machine test has its limitation, so the design and development of the College English Test System based on network has become must. This system introduces 3 layer of mixed C/S and B/S module. Delphi programming language is chosen and SQL Sever 2000 database is used as the development too. This study analyzes the structure of system function module and studies the technology of drawing exam questions and at the same time we emphasize the paper marking strategy of English translation subject.