Safety belt is one of the most important safety configuration to ensure the safety of automobile. Firstly on the structure and principle of automobile safety belt are summarized, followed by the description of the core components and technology, finally makes a prediction of the trend of development of the technology, and points out that the combination of intelligent automotive safety systems, active safety and passive safety technology is the trend of future development, safety belt technology also shun should be development trend; at the same time, safety belt system parameters matched safety and comfort zone improvement is R & D and manufacture of another important development trend of safety belt. On the basis of this, the two level limit of safety belt, the early warning and the limit of force type safety belt, airbag type belt and the four point safety belt will become the focus of enterprise product development direction. <<