Today's society is the era of big data. Sien Chen explained the epitome of the application of big data in smart cities in the future. In the future, walking on the road, you can not only see the traffic, but also see the contribution of big data to transportation. Ten years ago, smart city was just a concept that stayed in the laboratory. Ten years later, this construction has been in full swing. Smart cities represent huge business opportunities and the changes that will come to our lives.