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At present, the automatic retrieval system of forensics information does not filter the potential retrieval risk of forensic information, which leads to the problem of poor control effect, low retrieval efficiency and high error. Therefore, a system of automatic retrieval of risk control system of bus network forensics information is designed. After collecting the input information in the acquisition module, the risk control module is sent to the DSP for automatic retrieval after the risk filtering and risk control of the collection information information. The STM32F407 design interface circuit is used to connect the acquisition module and the risk control module to complete the improvement of the hardware part. It selects high degree of retrieval relevance node, uses node built-in documents to achieve the control of risk of forensic information retrieval, and completes the software part design. The experimental results show that the system has a good control effect and a control precision of more than 80%. It can provide more effective and safer information retrieval results for the users.