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It has been proved that speed guidance strategy could improve traffic safety and reduce fuel consumption effectively. There have been a large number of speed guidance experiments and practical applications in some developed countries, such as Britain, Germany, and America. The development of three guidance methods' research at home and abroad is introduced in this paper, they are group speed guidance, speed guidance with driver assistance system, and dynamic speed guidance. Then three experiment methods are summarized. Finally, the development trend of speed guidance in VII is presented. Keywords: speed guidance; variable message signs; driver assistance system; vehicle infrastructure integration INTRODUCTIONRoad transportation is one of the main components of the transportation industry. How to improve its safety and save energy are key issues for society. The operation speed has the closest relationship with traffic safety and fuel economy among many factors (Pei, Cheng, Dai, et al. 2008). The suitable speed not only can reduce the accident rate, but also can improve energy efficiency and reduce unnecessary fuel emissions. Meanwhile, with the increase of urban transportation pressure, the traditional traffic control methods cannot satisfy the current demand for safety, efficiency and energy consumption. Speed guidance theory has been used as one of the key techniques to alleviate above problems effectively.