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The study aims determine be found or not the effects of Realistic Mathematics Education (RME) learning models on students’ mathematics reasoning ability. This study was conducted in 174 Junior Hight School Jakarta. The population in this study are all students of class VIII in the 2nd semester with sample of 70 students. This study uses True Experimental Design type posttest-only design. The instrument of this study is a test of the mathematics reasoning ability as many as 10 items with the valid exercises 8 items which has been tested the validity, reliability, distinguish feature and difficulty level. Based on the results of analysis using t- test at the level 0,05 of significance, there is obtained t arithmetic of 4,361 and table t of 1,669. The effect of the learning models is classified by effect size, the result is 1,265 including on the high criteria. Therefore, from this study can be concluded that there is the influence of Realistic Mathematics Education (RME) learning models on students’ mathematics reasoning ability.