Abstract: Achievement test is an absolutely necessary link in college English teaching.It is a means to test the effect of the students’ learning and the teachers’ teaching.Reliability and validity are the most important characteristics in the measurement of achievement test.The investigation of reliability and validity involves the research purpose and the content.To know these,the object,fair,scientific and valuable test paper can be designed and it is helpful to improve the test evaluation system.

Key words: achievement test, reliability, validity