The purpose of this research is to determine and analyze the aspects of the promotion mix that are advertising (X1), sales promotion (X2),and personal selling (X3) to purchasing decisions (Y) on the Alfamart product house brand at Alfamart Sebantengan Ungaran. The methods of data collection used in this research were interview, literature study and questionnaires. The questionnaires used a simantic defferensial with 10 point scale and method of collecting the sample used was purposive sampling as many as 100 samples. The analysis tools used were test of validity, reliability test, threebox methode test, asumsi classic test, t test, F test, the coefficient of determination and multiple linear regression. Based on the calculations using SPSS version 21, the results of this research showed that the regression equation Y= 0,330X1 + 0,333X2 + 0,240X3 + e. In addition, the F test result of 53,501 which was bigger than F table was 2,70. Similarly to the F test, the t test result was bigger than t table and had a significance less than level significance of 0,05. So, it can be concluded the promotion mix of advertising (X1), Sales promotion (X2), and personal selling (X3) had a positive and significance influence to purchasing decisions (Y). The most influential variable variable is sales promotion (X2) with the highest regression coefficient of 0,333.