There are some concerns about solving traffic problem in big city. Generally speaking, traffic regulation, road construction and public transportation are three main aspects. First of all, we can solve traffic problem though traffic regulation. We must have consummate traffic regulation to regulate traffic. Meanwhile, it is necessary to enhance the people` and drivers` sense of law and concept of rule by law. Of course, road construction is also important. We should improve the quality of roads by constructing more high ways. In addition, we may build subways to release the burden of roads. Finally, we should develop public transportation system. The number of private cars should be limited while the number of public buses should be increased.