This research focused on the effect of using Synthesizing Strategy on Students‟ Reading Comprehension Ability at Grade XI SMA N 1 Panyabungan. The problems of this research students were lazy to read, students had lack motivation in reading, also students got difficulties in reading even though have read in many years. The purpose of this research was to find out the effect of using Synthesizing strategy on students‟ reading comprehension ability at grade XI SMA N 1 Panyabungan. This research employed experimental research. The population of this research was XI Sains grade of SMA N 1 Panyabungan. The total of population were fourth classes. Then, the sample of the research was 2 classes, experimental class (XI MIPA-3) and control class (XI MIPA-2). It was taken cluster sampling after conducting normality and homogeneity test. To collect the data, researcher used test for measuring students‟ reading comprehension ability. To analysis the data, the researcher used T-test.
Based on the result of the research, researcher showed the description of the data was found that mean score of pre-test in experimental class was higher than control class (52.8>50.13). Then, after using Synthesizing strategy the result of mean score post-test experimental class was higher than control class (86.04>78.4), and the score of tcount was bigger than ttable (3.056>2.000). It means that hyphothesis alternative (Ha) was accepted. It was concluded that there was significant effect of using Synthesizing Strategy at Grade XI SMA N 1Panyabungan
