All visitors to China must meet the following entry requirements:

- Valid travel document (with a minimum validity of 6 months);
- Onward/return ticket;
- Entry facilities to next destination;
- Sufficient funds to stay in China;
- Visa for China (*if applicable).

Visa-free policy

Unilateral visa-free policy: Brunei, France, Germany, Italy, Spain, Holland, Malaysia, Switzerland, Ireland, Hungary, Austria, Belgium, Luxembourg, New Zealand, Australia, Poland, Portugal, Greece, Cyprus, Slovenia, Slovakia, Norway, Finland, Denmark, Iceland, Andorra, Monaco, Liechtenstein, Korea, Bulgaria, Romania, Croatia, Montenegro, North Macedonia, Malta, Estonia, Latvia, and Japan.

Mutual visa-free policy: The United Arab Emirates, Barbados, Bahamas, Bosnia and Herzegovina, Ecuador, Fiji, Grenada, Mauritius, San Marino, Seychelles, Serbia, Tonga, Belarus, Qatar, Armenia, Albania, Dominica, Suriname, Maldives, Singapore, Thailand, Georgia, Kazakhstan, Antigua and Barbuda, Solomon Islands.
The latest policies shall be subject to official announcements issued by local immigration authorities.

Request for Visa Application Document(s) - Invitation Letter
Please note that you must apply for your own visa application. MDPI is not responsible for any visa application. However, MDPI can provide a Visa Support Letter. To be eligible for such a document, the criteria below must be fulfilled:
1. Applicants must have paid for registration and submitted an abstract in order to get a letter of support.
2. Applicants must provide us with a scan of their valid, in-date passport that contains a photo of them.
3. Applicants must provide us with a letter of support from their institution to confirm that they support the delegate attending the meeting.
4. This must be carried out in good time before the meeting; "last minute" requests will not be processed.