<p>The research aims to know relation, (1) self-efficacy and achievement  of study, (2) social interaction and achievement of study, (3) with together between self-efficacy and social interactionwith achieviement of study in student environment guidance conceling Islamic Department Dawah Faculty and Communication science of IAIN Padangsidimpuan on academic 2013/2014. Kind of this research expost facto. Population of the research all of students guidance conceling Islamic Department Dawah Faculty and Communication science of IAIN Padangsidimpuan on academic 2013/2014, are totally 187 students sampling technique is used sampling nonprobability with saturate sample technique on often mentioned study cencus so sample totally 187 students.</p><p>Collecting data method is used that questionarry method to measure self-efficacy and social interaction and record keeping method to measure of achievement study. Analysis data technique is used descriptive statistic analysis and regression analysis.</p>The results showed that: (1) (1) there is a positive and significant relationship between self-efficacy and the learning achievement with a correlation of 0.686. (2) There is a positive and significant relationship between interaction social and the learning achievement with a correlation of 0.788. (3) Taken together there is a positive and significant relationship between self-efficacy and interaction social to learning achievement with correlation of 0.854. Based on these results, it was concluded that student achievement is influenced by self-efficacy and interaction social.