1. Confirm the changed contents: First, you need to confirm the changed contents. If the changes are important, such as price and model, you need to sign a new contract. If the altered content is not important, such as some typos or typos, it can be supplemented.
2. Revision: If the revised content is not important, you can revise it yourself. When repairing, it needs to be smeared with black gel pen or correction fluid to ensure that the handwriting is clear and readable. Be careful not to use too obvious alteration, so as not to affect the legality of the contract.
3. Confirmation by both parties: After the maintenance, both parties need to confirm the contract again to ensure that the contents of the contract are correct. If the content of the change involves important terms, both parties need to renegotiate and reach an agreement.
4. Keep copies: After the contract is signed, both parties shall keep their own copies of the contract for future reference.