Citi-bike is the largest bike share program in the US, it gives citizens a healthy, interesting and affordable way to get around town. In this project, we look into the generation because we are curious about whether younger people are less likely to use bike for commuting, generally, public transportation and bicycle are cheap transit methods, either workers or students would love to use, however, since students may have another choice: school bus, it may lead to students(post-90s) less likely to use Citi-bike for commuting. In the end, If we can learn Citi-bike user pattern differences between generations, this project can gives suggestions for location of Citi-bike station, for instance,  establish more Citi-bike stations near office building or school to fulfill the larger demand of specific people.