You cannot. There's nothing you can do to avoid your application from getting audited. PMI randomly selects a small percentage (about 10%) of applications for audit.
However, you can take some steps to prepare yourself to face the audit and ensure that the audit goes through smoothly, in case your application gets audited.
Here's my recommendation - this needs to be followed before you submit your application.
To ensure that your audit goes smoothly, the best practice is to establish contact with all the people whose name you intend to list as your managers/supervisors on your PMP application.
Let them know that you are applying for PMP certification and you want to list their name on the application form as your manager/supervisor. Remind them of the projects, which you did under their supervision, and intend to include on your application. Tell them about the audit process and the possibility that you might need their help to verify your experience, in case your application gets audited. Request their current contact details such as contact number and office address. Also tell them that PMI might contact them through phone or email to verify your experience.
If you are unable to contact them, or get their concurrence on your application due to any reason, look for alternatives even before you file your application. If you follow this practice, and fill your application truthfully, you don't have anything to fear from the audit. It will also take away lot of unnecessary stress and anxiety, and help you prepare better.
Good luck and thanks for reading.