Pre-shipment inspection includes: (a) the inspection of imported used machinery and electronic products is consistent with the national approval of the project. Verify whether a product meets the mandatory product certification system, import licensing quality management and other requirements in accordance with the provisions of the existing immigration verification. Physical condition (b) verification of the import of used mechanical and electrical products, goods name, size, type, quantity, origin, date of manufacture, the old and new status, price, etc. are consistent with the contract or agreement. (C) the safety, health, environmental protection and other projects Inspection: 1. Check the appearance cargo security identification and warning labels; 2. Inspect cargo security guards, security of electrical and mechanical components in the stationary state; 3. Check the goods In the running state security, reliability and stability; health, environmental protection and other projects 4. Inspection of goods. 3) old mechanical and electrical products, automatic import licenses: by HS code confirm the import of used machinery and electronic products whether they are automatic license management, some of the old equipment does not need to apply for this card can also be imported. Submit this card in determining the need to apply to the city after the mechanical and electrical related materials (business license (certificate of approval), a copy of the legal code certificate, letter of introduction, for the ID card and the need to provide a copy of a letter of introduction agent commissioned by the applicant's attorney, mechanical and electrical cross-examination, stamp) after the first instance by the city of mechanical and electrical, mechanical and electrical audit after the province issued a permit. Automatic import license required extension or alteration shall apply in the period, and re-apply in the original issuing agency. Automatic import license is valid for six months. The implementation of "one card" automatic import licenses needs to be extended or changed, and subtract the original number after the declaration has been verified, according to the remaining number of the issuance of new permits.