As a center of education city, there are many people from the different cities who come to Yogyakarta for continuing their studies. Universitas Islam Indonesia is one of universities that has many students coming from the divergent social backgrounds. One of the majors in Universitas Islam Indonesia is Islamic Economics which is including of Faculty of Islamic Science. It can be seen according to the major, Islamic Economics is a part of Faculty of Islamic Science. Since human lives in a circle, so that they unconsciously form habits which are often affected by its environtment, including to the student's consumption behavior in their circle. Moreover, this research analizes whether the background of the Islamic social environtment has portrays the Islamic Economics student's consumption especially for class of 2012 and it affects to the student social environtment how the impacts of the student's social environtment based on the consumption behavior perspective of the Islamic Economics major. This research uses the drescriptive quanitative by taking respondent sample based on purposive sampling method. Furthermore, the writer uses questioners to collect the data and using double linier analysis technique to process the data. As the result, the writer finds that the consumption of the Ekis FIAI UII 2012 student has followed the principal of aqidah and amaliah also spiritual, however it has not represented the simplicity principle yet. According to the "t" test, it shows that the variable of adherent group has no significant influence to the Islamic  consumption of the Ekis FIAI UII's student especially for the class of 2012, it is because of the value of the 't' is smaller than the table of 't' that is 0.728 < 2.011. The amount of the value of the "t" for the family variable is about 2.506, so it has a significant impact between family and Islamic student's consumption behavior. As the result of the free variables, it is known that the variable of the adherent group and family simultantly has no influence toward the Islamic consumption behavior variable. Adjusted R Square is 0,133, means that 13,3% that of the Islamic consumption behavior by Islamic Economics student of FIAI UII 2012 is affected by family. 
Keywords: Adherent Group, Family and Islamic Consumption Behavior.