Is it illegal to install a basketball stand on the fire exit door of a residential area?

Illegal. According to Article 28 of the Fire Prevention Law of People's Republic of China (PRC), no unit or individual may damage, misappropriate or dismantle or stop fire control facilities and equipment without authorization, bury, occupy or block fire hydrants or occupy fire prevention spaces, occupy, block or close evacuation passages, safety exits and fire truck passages. Doors and windows in crowded places shall not be equipped with obstacles that affect escape and fire fighting and rescue. Without permission, basketball stands shall not be installed in the public areas of the community. The public space of the community belongs to the public property of all owners of the community, and no individual may install the basketball stand without permission. The doors of fire exits in residential areas shall be kept in a normally open state and shall not occupy or block the fire exits.