Student understanding is  how a student is able to maintain, differentiated, assumed, explains, and What has been received. Understanding rather than merely thinking activities, but did experience the mind (experience life). The things to do  to achieve student understanding  is by ways student actively exploring learn directly.   Approach to natural roaming  around alternative in learning biology. In this approach, student are required actively exploring, learning envirotment as a source of biology, will be able to increase student’s understanding. Conclusions of this study, learning opproach to natural roaming  around with experimental methods can increase student’s understanding in SMA Muhammadiyah 2 Metro school year 2011/2012 of pre-PTK to the cycle 2 be 54% and suggestion that research can be used increase the student’s understanding.Kata Kunci: Jelajah Alam Sekitar, Aktivitas Belajar, Hasil Belajar
                        
                        
                        
                        
                            
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