As a pleasant experience of being immersed in the current activity, flow experience is an important factor that facilitates impulse buying behavior. In addition, consumers' perceived value in the virtual environment has a significant impact on the purchase decision making. This research employ questionnaires to investigate the consumers' psychological experience of online shopping, thereby study the relationship between flow experience, perceived transaction value, positive affect, shopping motivation, and impulse buying behavior. The results indicate that (1) flow experience and perceived transaction value, which mediated by positive affect, have positive impact on impulse buying behavior; (2) the positive relationship between positive affect and impulse buying behavior is moderated by hedonic shopping motivation. © 2017 IEEE.