The frame number cannot be changed. Frame number is called vehicle identification code in Chinese, which is a set of characters assigned to a car by the manufacturer for identification. The frame number that has been entered into the computer cannot be changed.

The frame number first appeared in 1949, and has replaced the multi-generation standard so far. The current frame number standard is unified all over the world, with a 17-digit identification code. The frame number of Chinese cars is mostly in the engine compartment, the left side of the dashboard, or the lower left side of the windshield.