Samsung is the producer of smartphone ranking one in the world. Although getting first rank, market share of Samsung decreased. The Purpose of the research were to find out the influence of life style and product’s attributes on purchasing decision of Smartphone Samsung Galaxy in Semarang City. The methods of Collecting data used in this reseach were questionnaire, and literature studies. The analysis the research was done trough regression, especially multiple liniear regression analysis. The sampling technique used in this study were purposive and accidental sampling. The samples were 50 respondents. The result of this study was that the calculation of coefficients regression showed that Y = 0,155X1 + 0,706X2. It meant that the result of regression has given positive influence on purchasing decision of Smartphone Samsung Galaxy , and the influence of product’s attribute was greater than the life style. The Coefficient determination is 0.404, which meant that 40,4% of purchasing decision of Smartphone Samsung Galaxy could be explained by the life style and product’s attributes . Meanwhile, the rest of the 59.6% was influenced by other variables which were not included in this study.