Abstract: In view of the multi-task information characteristics of the intelligent vehicle domain controller, a data export system for multi-task network communication is proposed. The system decomposes the absolute path required by task management into sub directory fields with low coupling, extends the function of single-file breakpoint resuming to multi-task scenarios to improve the efficiency of data transmission. Next, according to the storage characteristics of driving data, a variable-step data extraction method is proposed, and the time stamp information is used to realize the rapid retrieval and positioning of effective data. The experimental results show that the method achieves efficient data transmission and accurate extraction, which proves the effectiveness of the method.