It's not illegal to draw after the expiration date. However, the national flag and its pattern shall not be used as trademarks, patented designs or commercial advertisements, and shall not be used in inappropriate occasions such as private funeral activities. At the same time, the damaged, defaced, faded or substandard national flag shall not be hoisted or used, and the national flag shall not be hung upside down or inserted upside down or hoisted or used in other ways that are detrimental to the dignity of the national flag.
Legal objectivity:
Article 23 of the National Flag Law of People's Republic of China (PRC) * * * Whoever intentionally insults the people of China and the national flag by burning, damaging, scribbling, defacing or trampling in public places shall be investigated for criminal responsibility according to law; If the circumstances are relatively minor, the public security organ shall impose a detention of not more than fifteen days.