Mathematical reasoning ability, are component that must be governable by the student. Mathematical reasoning plays an important role, both in solving problems and in conveying ideas when learning mathematics. In fact there ability are not still developed well, even in middle school. The importance of mathematical reasoning ability (KPM are parallel in improving student skill to mastery those three abilities. Therefore it is necessary to apply learning strategy that is expected to improve the KPM, in mathematics teaching. This research applied mind mapping strategy (SMM) as an alternative to improve all three. This aims to find out contribution level in SMM application to ward the enhancement of mathematical reasoning ability, at school rank (low, high and medium), KAM (high, medium and low). The research is a quasi-experimental research by using Pretest and Posttest Control Group Design. The sample in this research is 130 students in eight of two School in Ambon. Each school represents high school rank and medium school rank. The hypothesis was tested at 5% significance level. The data were analysed by applying the Kolmogorov-Smirnov (KS), Levene test, t-test, t'-test, Mann-Whitney U test, and ANOVA two lines. The result shows that: (1) there is a difference achievement, the enhancement of KPM, in experiment class and control class; (2) there is an interaction between learning and school rank in enhancing the ability of mathematical reasoning; (3) there is no interaction between learning and KAM in increasing reasoning ability. A bibliography is included.