Whether the contract is valid without signing must be determined based on the actual situation. If both parties have actually performed the contract, the act will also have legal effect on both parties. For example, the seller did not sign the contract, but actually shipped the goods to the buyer and fulfilled its obligation to deliver the goods. The buyer also signed for and paid for the goods. The validity of the sales contract will not be affected by the defect of not having a signature. According to the Civil Code, a contract established in accordance with the law shall take effect from the time of its establishment, unless otherwise provided by law or otherwise agreed upon by the parties. In accordance with the provisions of laws and administrative regulations, if the contract should be subject to approval and other procedures, the provisions shall be followed. If the failure to go through approval and other procedures affects the effectiveness of the contract, it will not affect the effectiveness of the contract's obligations such as reporting for approval and the effectiveness of related clauses. If the party that should go through the application approval and other procedures fails to perform its obligations, the other party may request it to bear the responsibility for violating the obligation. Article 502 of the "People's Republic of China and Civil Code" Contract Effective Time A contract established in accordance with the law shall take effect from the time of its establishment, unless otherwise provided by law or otherwise agreed upon by the parties. In accordance with the provisions of laws and administrative regulations, if the contract should be subject to approval and other procedures, the provisions shall be followed. If the failure to go through approval and other procedures affects the effectiveness of the contract, it will not affect the effectiveness of the contract's obligation clauses such as submission for approval and related clauses. If the party that should go through the application approval and other procedures fails to perform its obligations, the other party may request that it bear liability for violating such obligations. In accordance with the provisions of laws and administrative regulations, if the modification, transfer, termination, etc. of a contract require approval and other procedures, the provisions of the preceding paragraph shall apply.