Abstract: An English diagnosis assessment system and method are provided to improve English study results. The system includes a server host, an ability indicator database, a test item database, a testing module, a test result database, a test taker analysis module, and a teacher analysis module. The ability indicator database includes at least one test taker ability indicator and at least one teacher ability indicator. The test item database includes plural test items and their correct answers. Each test item corresponds to at least one test taker ability indicator and at least one teacher ability indicator. The test taker analysis module converts and compares the test results of at least two test takers to produce a qualitative analysis result for each test taker. The teacher analysis module converts and compares the test results of test takers taught by at least two teachers to produce a qualitative analysis result for each teacher.