Smartphone is booming in the global market. It not only raises the sales growth of whole cellphone, but also have great growth ability. The introduction of smartphone also changes the user’ using habits, provides powerful product functions and influences the industry significantly. As a result, this research discusses the trajectory of the formation and evolution of smartphone, and test if there is consistency between the theory and reality. This research discusses the type of innovative technology and technology cycle model for theory review. Besides, this research adopts the historical research and case study for research method. From the research result, this research obtains the trajectory of the formation and evolution of smartphone, and then compared with the theory, see if the consistency exists. This research obtains two conclusions from the test result. First of all, from the development process of smartphone, the product designs generate individually and gradually. Than these designs can form a set of designs which can form a smartphone. When the smartphone with the set of designs satisfy the condition, the set of designs become dominant design. Therefore, dominant design should be the architecture level. The second, this research take the operating systems for observation object and refer the market share, through the logically inference, this research result shows that the dominant design haven’t emerge.