According to the relevant information, Lu Hui was arrested by the Sihui Municipal People's Procuratorate on suspicion of intentional injury causing serious injury to the victim. Lu Hui is from Sihui City, Guangdong Province. Joint investigation is an important investigation measure for the investigation department of public security organs to handle cases. It refers to a kind of investigation method that connects a series of cases made by a criminal or a group of criminals in series and organizes special projects to carry out one case together, one case after another. It can maximize the concentration of criminal information and narrow the scope of investigation, so as to achieve the purpose of solving the case quickly and saving litigation resources.