You need to consult the local tax bureau for this. It seems that there are the following things: 1. Certificate of business management abroad; 2. Copy of construction contract stamped with the official seal of the unit; 3. Enterprise business license, tax registration certificate, etc. Copies of the five certificates stamped with the official seal of the unit; 4. Letter of authorization; 5. Proof of payment by the construction unit; 6. Copy of the authorized person’s ID card stamped with the official seal of the unit. I forgot about so many others