With the development of our country，more and more young people from Hong Kong and Macao choose to study in the mainland and then stay in the mainland to seek development after graduation.These changes make us pay more attention to the physical and mental development of Hong Kong and Macao students.To explore the relationship of three aspects of consumer guilt，impulsiveness and decision-making style on university students from Hong Kong and Macao，and the mediation effects of decision-making style on university student consumer guilt and impulsiveness.By using the self-made Consumer Guilt Scale for Chinese Adult（CGS-CA），the General Decision-MakingStyle （GDMS） and Barratt Impulsiveness Scale Eleventh Edition （BIS-11），I had made a survey of 432 Hong Kong and Macao university students in Beijing universities，then using the structural equation model to analyze the relationship between three variables.Results：（1） There is a significant positive correlation between impulsiveness，consumer guilt，anddecision-making style，impulsiveness has an obvious positive prediction on decision-making style and consumer guilt.（2） The intermediary effect of decision-making style between impulsiveness and consumer guilt accounts for 57.13% of the total effect.（3） By using the method of Bias-Corrected Percentile Bootstrap to test the mediation effect，I had found that the confidence interval of 95% of Mediation effect between impulsiveness and consumer guilt is 0.0551-0.2146，and the total effect of the model is 0.7019，the direct effect of the model change to 0.2885，the indirect effect is 0.4134，the total intermediary effect of decision-making style is 56.76%.From these results，it is not difficult to see that Hong Kong and Macao students share the same consumption tendency as the new generation of young people.This study confirmed decision-making style of Hong Kong and Macao College Students in the impulsiveness and consumer guilt was significant mediation effect.