During the process of assisting XX's son in applying for an entry and exit permit, the lawyer team formulated a detailed full-process case schedule of "application document preparation - application submission - approval and certificate collection", and clearly defined the task division. They also conducted research on the regulations of Zhumadian area, obtained the contact numbers of the public security bureau and other departments to sort out the processing requirements and procedures. Draft and review documents such as the "Application and Approval Form for Extension and Reissuance of Hong Kong, Macao, Taiwan and Overseas Chinese Documents", and guide XX to fill in and prepare the materials. Meanwhile, the team led by Lawyer Liu Sen organized multiple meetings and communications with XX, coordinated meetings with the Public Security bureau, assisted in submitting applications in Xincai County and provided emergency contact channels, followed up on the acceptance receipts to ensure a smooth process, and through professional process planning, legal research, document processing, and communication coordination, promoted the legal and efficient completion of the application for entry and exit permits. Help solve the problems related to their entry and exit documents.