The primary purposes of this final project are to identify the influence of promotion and quality product on purchasing decisions and to find out the most dominant variable influence on the purchasing decisions Toyota Avanza at PT. New Ratna Motor Branch Nasmoco Pemuda Semarang. The sampling technique used in this final project is the purposive sampling. The methods in collecting data are questionnaire and literature review. The analytical method used is multiple linear regression method, test reliability, test validity, F test and t test. Multiple linear regression method produces equations Y= 3,457 + 0,241X1 + 0,374X2. Test reliability and validity of the test shown that the data are reliable and valid. Hypothesis is proved by using the f test and t-test which lead to the conclusion that: variable promotion and quality product has a positive effect on purchase decisions Toyota Avanza in PT. New Ratna Motor Branch Nasmoco Pemuda Semarang. But the promotion variable not significantly on purchase decisions.