The present study aimed to explore the impact of teaching critical thinking skills through applying debate on the use of communicative strategies. At first 60 intermediate students were selected and placed in two homogenous groups of control and experimental through passing Nelson test. Then, a critical thinking appraisal was run to the two groups both before and after the treatment. The treatment that experimental group received during the term was 10 sessions of debate as a classroom activity. The analysis of the collected data exhibited significant difference between the two groups concerning critical thinking skill. The results showed that the subjects in experimental group were oriented toward critical thinking. In a subsequent stage, the subjects were asked to write a story in English based on a series of related pictures. Then, the number of communicative strategies including achievement and reduction ones were counted carefully. A t-test was run to find whether the differences between the two groups regarding the use of such strategies were significant or not. The results revealed that the subjects in experimental group used more achievement strategies. Concerning the use of reduction strategies by the two groups no significant difference was found.
