Can a utility model patent only have a flow chart?

No! !

Utility model refers to a new technical solution proposed for the shape, structure or combination of a product that is suitable for practical use.

If the utility model patent only has a flow chart:

1. The drawings cannot reflect the shape and structure of the product claimed, and are inconsistent with Article 17, Paragraph 5 of the Implementing Rules of the Patent Law. regulations.

2. It does not comply with the provisions of Article 26, paragraph 3, of the Patent Law.