At present, the research and application of video technology mainly focus on the processing of video images by image processing and pattern recognition. The video capture is started from the capture time point, thus the information contained in the captured video lacks integrity, that affects further analysis and processing. Aiming at this problem, design and implementation of a video capture scheme are proposed based on Android system by defining the time window and using the cache technology. The key is to provide video for a certain period of time from before to after the capture time point. The test results show that the capture scheme has a small time error and occupies less system resources, and has been applied to vehicle electronic systems which are mass-produced and put into the market, providing an important basis for traffic accident liability identification.