Comprehension of mathematical concept of students in class VIII of SMPN 33that still low. The purpose of this research is want to know the studentsunderstanding of mathematical concept by applying the type of active learningstrategies The Study Group and quis are better than students understanding ofmathematial concept by applying the conventional learning. This was anexperimental research which used random research design toward the subject.The population of research is the student in class VIII SMPN 33 Padang is the 7classes. The instrument used in this research is a quis and test in studentscomprehension of mathematical concept. Based on the result of data analysis, itwas revealed that the sample was distributed normally and not homogeny variant.Hypothesis test results obtained Ýá± (4,614) and ttable (1,708), the hypothesis wasaccepted. So, it was concluded that the application of The Study Groupstrategies could improve the students comprehension of mathematical conceptbetter than the conventional learning.