This study aimed at designing Computer-Based Summative Test software as a tool to support English Test. To make sure that the learning objectives are fulfilled, the testing materials should be in line with the curriculum and learners' needs. This study was attempted to design reading testing software based on teachers' and students' needs. The software was designed because it can solve the testing problems. In this research, the researcher uses ADDIE approach where the participants are the teachers and the eleventh grade students of SMA Sentosa Pemangkat. This study found that students' summative tests need a new testing system which can randomize test items and fasten test result publishing. The result showed that the software can be used by the teacher and students as a software to test students' reading achievement in summative test. The researcher suggests that the teachers use this software to help them in testing