Depending on what kind of competition it is, some can be withdrawn and some cannot.

Legal basis: Article 502 of the "People's Republic of China and 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 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.