In the process of driving a motorcycle, drivers have to wear helmets to ensure safety. However, there are some inconveniences and potential safety risks when drivers have a phone call or want to check the time while driving. In order to solve these problems, this paper studies the intelligent helmets which use Bluetooth connection to Android phone. The user can operate mobile phone and helmet to realize relevant functions through speech recognition. It uses 51 single chip microcomputer as the central processor to manipulate and control the Bluetooth module as well as other functional modules. Meanwhile, an APP is designed to enhance the user experience. It provides an easier interoperate between helmet and mobile phone via Bluetooth technology. This APP realizes not only data transmission function, but also instructions recognition and speech synthesis function.