The opportunities and challenges, fashion and charm of the first big cities in China have always attracted a large number of people to come in. With the rapid development of urban economy and the upgrading of construction, the traffic load has become increasingly serious. From the pleasure of owning a private car to traffic jams and parking difficulties; From the popularity of DIDI to the controversy over price and travel safety; From the outside drifters eager for the city to travel inconvenience and have stopped; From the craze of Shared bikes till it’s almost sticky .. . All show: big cities need a new way to travel, a truly free travel tool.