Abstrak
This research was done to find out the effect of using think pair share strategy on students writing ability in descriptive text at seventh grade students of junior high school in MtsS Ashhabul Yamin, Lasi Tuo. The background of this research was based on the students problems in writing ability when learning English. First, most of the students said writing was difficult to understand. Second, many of the students still had limited of vocabulary. Third, some of the students were difficult to writing the good sentences. In this research, the researcher used quantitative method with quasi-experimental research design by comparing two classes. The population of this research was the seventh grade students of junior high school at MTsS Ashhabul Yamin, Lasi Tuo, namely 7.6 as experimental class with consist 28 students and 7.9 as control class with consist 27 students. The instrument of this research was writing test. The data was analyzed by using paired sample t-test and independent sample T-test in SPSS 22. The result of the research indicated that there was significant effect of students writing ability between the students who were taught by using think pair share strategy and without using paragraph shrinking. It can be seen from p-value which was smaller than the alpha value(0,0000,05). From the result of the data, it can be concluded that, using think pair share strategy gave significant effect of writing ability in descriptive text .