This study aims to analyze the influence of satisfaction and trust on repurchase intentions with the moderating effect of the perception of the effectiveness of the e-commerce mechanism. The independent variables in this study are satisfactoin, trust as mediation variables, repurchase intention as dependent variables, and perception of the effectiveness of the e-commerce mechanism as moderating variables. The object used in this research is Lazada. The sample of this study amounted to 176 respondents selected by using purposive sampling method. Data analysis technique used in this research by using Structural Equation Modeling (SEM) with the help of AMOS 23. Analysis of instrument quality test data in this research using validity test, reliability test, and normality test. The results showed that satisfaction has a significant positive effect on vendor trust, the perception of the effectiveness of e-commerce mechanisms is able to moderate the relationship between satisfaction and trust in the vendor is positively significant, and trust in the vendor has a significant positive effect on repurchase intention.