In recent years, energy conservation and LOHAS lifestyle have attracted increasing attention, and riding bicycles has become popular around the world. Public bike systems have been set up in numerous cities to provide rental bikes to citizens and travelers as an alternative to taking short-distance car trips. In Taiwan, three such systems were established in Taipei City, Kaohsiung City and New Taipei City on March, 2009 and September, 2013. The purposes of setting up public bicycle rental system are in addition to a low-carbon, sustainable and short-distance feeder, but also responsible for raising the city international image and the visibility missions. This study intended to Youbike system in Taipei City as object of study to explore user cognition on this system of city marketing promotion and product positioning. This study used questionnaires to access user cognition, and cluster analysis, descriptive statistics and cross analysis been used as the analysis methods. The results indicate that, in products positioning aspects, respondents identity that Youbike is environmentally friendly, tourism, leisure and feeder conveyance, but fashion/pop of identity degree relative lower; in city marketing contribution aspects, respondents identity that Youbike can upgrade Taipei City of city image, and environmental image, and life quality and the let traffic more friendly, but for upgrade Taipei City of international competitiveness of identity degrees lower. This study confirmed that Youbike system in city marketing has gained high recognition, and it been recognized as tourism, leisure and feeder conveyance, it is recommended that Government departments on the selection of new stations, apart from the transport station and major tourist attractions, and may also consider setting station in residential quarters, office buildings, and strengthened its feeder feature.