Objective: Nowadays, consumers usually make many instant purchases without planning,  and personality factors have a great impact on instant purchase tendencies. The purpose of this research is to investigate the effect of personality types on on customers' instant purchase tendencies. 
Method: The present study is applied in terms of purpose and descriptive-survey in terms of method. The research model was explained in three independent, dependent and moderating parts, in which two variables of customer and salesperson personality type were identified as independent and moderating variables, respectively, and the instant purchase tendencies was determined as the dependent variable. Based on this model, a questionnaire was prepared and distributed among a statistical sample of 385 hypermarket food product customers in Tehran using cluster sampling. 
Results: According to the outputs obtained from the calculations, all hypotheses were confirmed except for two hypotheses: the effect of openness to customer experience on customers' instant purchase tendencies and the effect of customer conscientiousness on customers' instant purchase tendencies.
Conclusions: According to the obtained results, the highest impact coefficient is related to the effect of sales staff compatibility on the relationship between customer compatibility and instant buying, with 0.78, tendencies, and the lowest impact coefficient is related to the impact of customer compatibility on the instant purchase, with 0.55 tendencies.