Answer: Exhibits sold are exported in the form of general trade. The destination country carries out permanent import customs clearance; the returned exhibits are temporary export customs clearance operations. The destination country carries out temporary import customs clearance, which needs to be returned after the end of the exhibition. Chinese and foreign customs have strict regulations on this, otherwise it will lead to the return of exhibits in China can not be smoothly cleared or customs imposed import duties. It is usually required to contact the carrier in advance and prepare to apply for ATA documents.