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Abstract：In a sparse traffic environment, the connected car data forwarding will be reduced, which causes the vehicle to carry data for a long time and can not be forwarded, so that a large data transmission delay occurs. In the current economic environment, research in this area who conducive to the development and application of the connected car. To solve the problem, author analyzes the prediction of vehicle sparse trajectory data and characteristics two-way traffic delay . By theoretical analysis and simulation experiments, we discuss the data transmission delay performance of DDBT protocol in sparse traffic environment . With a view to providing some reference and reference for researchers in the future research on the connected car.