The extensive use of the internet and information technology in the field of education, coupled with the diversification of distance learning, has resulted in the emergence of online test systems. According to the patterns and features of English pronunciation test, the key technologies of ASP.NET, Microsoft SQL Server 2005, and Windows Server 2003 are used to conduct the design of the online teaching effect test system of English pronunciation. Based on demand analysis and functional design, this paper mainly introduces the main function modules, key technology and function realization of the online teaching effect test system and devises a set of online examination system of English pronunciation based on Web technologies to facilitate the assessment of students’ performance in the course of English pronunciation and intonation.