1. First of all, you need to understand the company's reimbursement policy, including reimbursement standards, reimbursement process, reimbursement time limit, etc..

Keep all the evidence related to business trips, such as tickets, accommodation invoices, catering invoices, meeting notices and so on. These evidences will help to prove that your business trip expenses are reasonable and comply with the company's reimbursement requirements.

3. According to the company's reimbursement process, you need to submit a reimbursement request.

4. After submitting the reimbursement request, you need to follow up the progress of the reimbursement. You can ask the finance department or your supervisor about the status of the request and make sure that these people are aware of your needs and problems.

5. Don't hesitate to ask for help if you encounter any problems or difficulties. You can ask your colleagues, the finance department or your supervisor for help and for support and advice.