This study aims to describe the implementation of Realistic Mathematics Education (RME) type Student Teams Achievement Division (STAD) to improve students’ communication abilities. This research is a Classroom Action Research (CAR) conducted in 2 cycles. Each cycle consists of four stages, namely: planning, implementation, action, and reflection. The subjects in this study were 7^th-grade students of SMPN 2 Kalianget as many as 30 students. The data collection techniques used in this study were observation, tests, interviews, and documentation. Data analysis used data reduction, data presentation, and concluding. The results showed that students’ activities and average test results increased from cycle I to cycle II. The results of the observation of students’ activities in the first cycle an average of 64.76% increase in the second cycle to an average of 90.00%. The test results in the first cycle were completed by 21 students (70%) with an average score of 70.30 and increased in the second cycle which were completed by 26 students (86%) with an average score of 80.83. The conclusion of this study was that can to improve students' communication abilities.

Keywords: RME, STAD, Student Communication