There has seldom been a study of Chemical education of Taiwan junior high school students. I hope this study will help us understand the students' process of learning chemistry and hence will help to develop better teaching materials and teaching methods. A.Purpose 1.To determine Students' cognitive ability in chemistry according to sex. 2.Comparison of the 8th grade with the 7th grade in test results. 3.Comparison of test results in the four geographical areas of Taiwan: North, South, central and East (including offshore islands). B.Methods: written multiple choice test (one right answer of four). Test of 40 questions to be completed in 40 minutes. C.Sampling: Stratified random Sampling of 31 public junior high schools from a total of 456 throughout Taiwan, including offshore islands Kinmen and Matsu. In each of these schools two 7th grade classes and two 8th grade classes were tested with average of 45 students in each. Of the 5,735 completed forms 3,078 were boys and 2,657 were girls. D.Data Handling: By computer. E.Results: 1.The girls are a little bit better than the boys. 2.The 8th grade students are better than the 7th grade students. 3.The north and the south are about on the same level. The central and the east (including offshare islands) are about on the same lavel, but the former is somewhat better than the latter.