The aim of this research was to find out the effectiveness of monopoly game for teaching writing descriptive text. This research used experimental method. The population of this research was all of the seventh grade students in Junior High School of 2 Banyumas in Banyumas with the total number of students 277. The sampling technique applied was random sampling one. There were two classes used in the research namely 7A class as experimental group consisting of 31 students and 7B as control group consisting of 31 students. The research was carried out from March 23rd to April 6th 2015. The experimental class was taught by using treatment while the control class did not. The researcher used test to collect the data, namely pre-test and post test. Pre test was conducted to know the basic competence of the participant in writing skill. The post test was conducted after the treatment. After the data was analyzed, the result of of t-test calculation was 3.11 while the t-table value at the level of significance 0.05 for degree of freedom (df) 60 was 1.67065. It means that t-test was higher than t-table (3.11 > 1.67065). Thus, the hypothesis was accepted or it means that Monopoly game was effective for teaching writing descriptive text.