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The problem in this research is the concept of critical biological thinking which became one of the most important things in the learning process that is through the application of Contextual Teaching Learning Model (CTL). The reason for this research is to know the improvement of critical thinking of student biology through the application of Contextual Learning Model an the material. The human Regulation system in class XI IPA1 SMA Negeri 1 North Panyabungan academic year 2016-2017. This typedoi:10.31604/ptk.v1i2.107-117 fatcat:ictjgz3ehfbzbbqvwtjvbuneou