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The purpose of this experiment was to analyze contribution of discovery learning and peer teaching (DL-PT) on student-s mathematical critical thinking (MCT) and self confident (MSC). The experimental took pretest-postest control group design and involved 72 eleventh grade students, a MCT test, a MSC scale, and perception on DL-PT and on DL scales . The study found that on MCT and its N Gain, students getting treatment with DL-PT attained better grade than students taught by DL alone; even if both student-s grades were at medium level, and students realized difficulties on examining the truth of enumeration process and on proving problem. On MSC, there was no different student-s grades between students taught by DL-PT and by DL alone and those grades were at medium level. In addition, there was no association between MCT and SCM, students learned actively during DL-PT and DL and students performed positive opinion on DL-PT and on DL