In this study, lexical decision task was used to examine information processing function in internal working models of attachment. It was hypothesized that when initials of best friend were presented as a prime stimulus, relationship-specific model would operate in addition to general model. Participants were 68 undergraduates. Results of hierarchical regression analyses on reaction inhibition, which was average reaction time on negative targets minus average reaction time on positive targets, revealed that primed participants showed larger reaction inhibition when they were presented with relationship-related words. The result supported the hypothesis of this study. Finally, limitations and future directions of this study are discussed.