Background of this research is based on the teaching reading process, which needs technique to make the students more active and interesting. Secret word game may help the students to increase their motivation in learning English especially in reading. The objective of this research is to find out the effectiveness of secret word game to teach students’ reading ability at eighth grade of MTs Al Hikmah Pasir Mijen Demak in academic year of 2015/2016. This research used an experimental method in conducting research. The population in this research is eighth grade of MTs Al Hikmah Pasir Mijen Demak in the academic year of 2015/2016. Class VIII A was chosen as an experimental class and class VIII C was chosen as a control class. The experimental class was taught reading using secret word game while the control class was taught reading conventional. The research used a quantitative measurement to find the result. The analysis of the data shows that there was significant difference between the average score of experimental class and control class. The average score of post test of experimental class was 74.35 which was higher than the average of post test of control class was 68.72. The t-test result 3.69 was higher than the t-table 1.99. Since the t-test was higher than t table, the hypothesis is accepted. Based on the result of this research, the researcher concludes that secret word game was effective to teach students’ reading ability at MTs Al Hikmah Pasir Mijen Demak in academic year of 2015/2016. The researcher suggests that secret word game may be used as alternative technique in teaching reading.