According to the regulations of the Examination Center of the Ministry of Education, barcode is an important symbol to match the information of examination papers and candidates. The dotted box is a reference line to ensure the accurate position of the bar code, but it does not affect the identification of the bar code. As long as the bar code is in the dotted box, the machine can scan normally and match the candidate's information. If the bar code exceeds the dotted box too much, the machine can't recognize it, and the test center will manually scan it to ensure accuracy. So it doesn't matter if the bar code is dotted.