According to the rapid development of the global economy and the continuous improvement of people's living standards, more and more people have a car driving license. We must pay attention to standardize the driving behavior of drivers, which is important to ensure personal safety. The survey also found that more than half of traffic accidents are related to dangerous driving behavior. However, in judicial judgment, there are many problems in judicial application which can not be solved because of the abstract provisions of laws in various countries. If the method of big data can be used as a reference for determining risky driving behaviors of drivers, it can provide evidence for identification, improve the accuracy of judicial judgment, and timely avoid some accidents. This paper aims to explore what application technical support is needed by judicial big data in determining risky driving behaviors of drivers.