The smartwatch has been recognized as a typical wearable device and an innovative product to overcome the stagnation of the smartphone market. In this paper, we consider the smartwatch as a continuous innovation product of the smartphone. The effects of user experience and perceived similarity of the smartphone on acceptance intention for smartwatch are analyzed. The results show that user experience of the smartphone has a positive effect on perceived usefulness and perceived ease-of-use of the smartwatch. The perceived similarity of the smartphone has a positive effect on perceived usefulness, perceived ease-of-use, and perceived aesthetics of the smartwatch. Perceived usefulness and perceived aesthetics have a positive effect on acceptance intention of the smartwatch. It means that useful functions and design are important factors for the smartwatches to be accepted to the users.